WO2023207723A1 - Communication method and communication apparatus - Google Patents

Abstract

The present application provides a communication method and a communication apparatus. In the communication method, a first terminal device determines that reserved resources of a second terminal device are within an initial COT of the first terminal device, and the first terminal device sends first COT sharing information to the second terminal device to indicate whether the second terminal device shares the first COT, so that the second terminal device can also use a resource in the initial COT of the first terminal device to perform sidelink transmission. Thus, COT interruption caused by the possibility that the first terminal device may not be able to perform continuous transmission within the initial COT can be avoided, spectrum utilization can also be improved, and transmission delay of the second terminal device can be reduced.

Description

Communication method and communication device

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on April 29, 2022, with application number 202210474978.6 and application title "Communication Method and Communication Device", the entire content of which is incorporated into this application by reference. .

Technical field

The present application relates to the field of communication, and more specifically, to a communication method and a communication device.

Background technique

In wireless communication systems, spectrum resources can be divided into licensed frequency bands and unlicensed frequency bands. When transmitting nodes use unlicensed frequency bands, they need to use spectrum resources in a competitive manner. Currently, sidelink (SL) communication is widely used in vehicle-to-everything (V2X) scenarios. Enabling SL communication in unlicensed frequency bands is an important evolution direction. Accordingly, The protocol technology can be collectively referred to as sidelink unlicensed (SL-U).

In SL-U, when the terminal device with the initial channel occupancy period (COT) shares the COT with other UEs, COT interruption may occur, that is, the terminal device with the initial COT cannot continue to use the COT. COT, resulting in the reliability of data transmission not guaranteed. Therefore, how to improve the transmission reliability of the terminal equipment of the initial COT has become an urgent problem to be solved.

Contents of the invention

This application provides a communication method and communication device that can improve the transmission reliability of the initial COT terminal equipment within the COT, improve the spectrum utilization of SL-U, and reduce the transmission delay of the terminal equipment sharing the initial COT.

In the first aspect, a communication method is provided. The method can be executed by a first terminal device, or can also be executed by a component (such as a chip or circuit) of the first terminal device. This is not limited. For the convenience of description, The following description takes execution by the first terminal device as an example.

The method may include: the first terminal device receives first sideline control information SCI from the second terminal device, the first SCI indicates the reserved resources of the second terminal device; the first terminal device determines the reserved resources of the second terminal device All or part of is located in the first COT, and the first COT is the initial COT of the first terminal device; the first terminal device sends the first COT sharing information to the second terminal device, and the first COT sharing information indicates whether to allow or not allow sharing of the third terminal device. One COT.

It should be understood that the first terminal device will only send COT sharing information to terminal devices with reserved resources located in the first COT.

In SL-U, the first terminal device of the initial COT needs to continuously transmit within the COT, or the first terminal device of the initial COT and the shared UE sharing the initial COT need to continuously transmit within the COT for a period of time. If there is no continuous transmission, the initial COT of the first terminal device will be interrupted, and the first terminal device will no longer be able to continue to use the COT. In the above technical solution, the first terminal device can perform the operation according to the SCI indication of other terminal devices (such as the second terminal device). The reserved resources indicate whether other terminal devices can share the initial COT, so that the transmission of the first terminal device and the transmission of other terminal devices can form continuous transmission at the COT to avoid interruption of the COT of the first terminal device.

In addition, the second terminal device can initiate COT transmission by itself or share the COT transmission of the first terminal device. For the former (the second terminal device's own initial COT transmission), if the reserved resources of the second terminal device are within the initial COT of the first terminal device, the first terminal device does not share it with the second terminal device for transmission (such as transmitting by itself or to Other shared UE transmission), then the second terminal device will not succeed in LBT before reserving resources. That is to say, the second terminal device can transmit at least after the COT transmission of the first terminal device is completed. For the latter (the second terminal device shares the COT of the first terminal device), the second terminal device can transmit in the time domain of reserved resources, thereby reducing the delay. If the first terminal device shares the initial COT with the second terminal device, spectrum utilization can also be improved.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: the first terminal device determines a first resource, and the first resource is used to transmit the first COT shared information.

It can be understood that the time domain resource and/or the frequency domain resource and/or the cyclic shift of the sequence of the first resource are used to indicate that the first COT shared information is indicated to the second terminal device.

With reference to the first aspect, in some implementations of the first aspect, the first terminal device determines the first resource, including: the first terminal device determines the first resource according to the reserved resources of the second terminal device; or, the first terminal device The device determines the first resource based on the reserved resources of the second terminal device in the first COT; or, the first terminal device determines the first resource based on the first reserved resource, and the first reserved resource belongs to the second terminal device in the first COT. Among the reserved resources in the COT, the first reserved resource corresponds to a time slot in the time domain and corresponds to a sub-channel or interleave in the frequency domain.

It can be understood that the first terminal device determines the location of the first resource based on the locations of reserved resources of different terminal devices, and may implicitly indicate the location of the first resource to the terminal device associated with the first resource by the first COT shared information.

In connection with the first aspect, in some implementations of the first aspect, the first reserved resource is the resource with the smallest time slot index, the smallest subchannel or the smallest interleaving index among the reserved resources in the first COT, or the first reserved resource. The reserved resource is the resource with the smallest time slot index and the largest subchannel or interleaving index among the reserved resources in the first COT, or the first reserved resource is the resource with the largest time slot index and the largest subchannel index among the reserved resources in the first COT. Or the resource with the largest interleaving index, or the first reserved resource is the resource with the largest time slot index and the smallest subchannel or interleaving index among the reserved resources in the first COT.

With reference to the first aspect, in some implementations of the first aspect, the first terminal device determines the first resource according to the first reserved resource, including: the first terminal device determines the first resource according to the time domain resource of the first reserved resource. The time domain resource of the resource, wherein the time domain resource of the first resource is a time domain resource that precedes the first reserved resource and is separated from the first reserved resource by at least a first time interval.

With reference to the first aspect, in some implementations of the first aspect, the first terminal device determines the first resource according to the first reserved resource, including: the first terminal device determines the first resource according to the frequency domain resource of the first reserved resource. The frequency domain resource of the resource, the frequency domain resource of the first resource is the frequency domain resource of the first reserved resource.

In conjunction with the first aspect, in some implementations of the first aspect, the first COT shared information is a sequence of the first resource, and the method further includes: the first terminal device determines a cycle of the sequence according to at least one of the following parameters or conditions Shift: whether the second terminal device is allowed to share the first COT; the time interval between the first reserved resource and the reference time slot, the reference time slot is the time slot of the first resource, or the starting time slot of the first COT ;Offset information in the time domain and/or frequency domain. The offset information in the time domain and/or frequency domain indicates that the resources shared by the second terminal equipment in the first COT are relative to the predetermined resources of the second terminal equipment in the first COT. The offset of the reserved resources in the time domain and/or frequency domain; the frequency domain resource of the first reserved resource.

Optionally, the first COT shared information is carried on the PSFCH, and the first resource is a resource for sending the PSFCH. Since the number of bearer bits of PSFCH is limited, in the above technical solution, the first terminal equipment can send the PSFCH by At least one of the time domain position, frequency domain position or associated cyclic shift information implicitly indicates whether which terminal device is allowed to use the first COT of the first terminal device. Since UE2 knows the time-frequency location of its reserved resources, it can determine that the PSFCH is sent to itself based on at least one of the time domain location, frequency domain location, or associated cyclic shift of the PSFCH. Therefore, when PSFCH carries the first COT shared information, compared with other signaling (such as first-order SCI, second-order SCI, MAC CE, RRC, PC5 RRC), the signaling overhead and delay are small.

In addition, when the reserved resources of multiple terminal devices sharing the first COT overlap within the first COT, the first terminal device may indicate the time domain or frequency domain offset information through the cyclic shift of the sequence of the first resource to ensure The resources actually shared by multiple terminal devices sharing the first COT within the first COT will not overlap, so that multiple terminal devices sharing the first COT can share the first COT at the same time. The reliability of the transmission of multiple terminal devices sharing the first COT is ensured; multiple terminal devices sharing the first COT can all access the channel as soon as possible, avoiding re-execution of the LBT process due to transmission conflicts, and reducing the time for UE information transmission. The extension also improves the spectrum utilization within the first COT from a system perspective.

In connection with the first aspect, in some implementations of the first aspect, the cyclic shift of the sequence is determined based on a first cyclic shift and a second cyclic shift, wherein the first cyclic shift indicates whether the first cyclic shift is allowed or not allowed. The two terminal devices share the first COT, and the second cyclic shift indicates time domain and/or frequency domain offset information.

In conjunction with the first aspect, in some implementations of the first aspect, the cyclic shift of the sequence is determined based on the first cyclic shift and the second cyclic shift, wherein the cyclic shift of the sequence indicates whether the first cyclic shift is allowed or not allowed. The two terminal devices share the first COT, the first cyclic shift indicates the time interval between the first reserved resource and the reference time slot, and the second cyclic shift indicates offset information in the time domain and/or frequency domain.

In connection with the first aspect, in some implementations of the first aspect, the cyclic shift of the sequence is determined based on a first cyclic shift and a second cyclic shift, wherein the first cyclic shift indicates whether the first cyclic shift is allowed or not allowed. The two terminal devices share the first COT, the second cyclic shift indicates the time interval between the first reserved resource and the reference time slot, and the third cyclic shift is the cyclic shift of the sequence of two adjacent RBs in the first resource. bit difference, the third cyclic shift indicates time domain and/or frequency domain offset information, or the first cyclic shift indicates whether the second terminal device is allowed or not allowed to share the first COT, and the second cyclic shift indicates the time domain and/or frequency domain offset information, the third cyclic shift is the difference between two adjacent RBs in the first resource, and the third cyclic shift indicates the time interval between the first reserved resource and the reference time slot.

In connection with the first aspect, in some implementations of the first aspect, the cyclic shift of the sequence of any RB in the first resource is based on the first cyclic shift, the second cyclic shift and the third cyclic shift. deterministic, among which,

The first cyclic shift indicates whether the second terminal device is allowed to share the first COT, and the second cyclic shift indicates the time between the first reserved resource and the reference time slot. interval, the difference between the third cyclic shifts of two adjacent RBs in the first resource indicates the time domain and/or frequency domain offset information,

or,

The first cyclic shift indicates whether the second terminal device is allowed to share the first COT, the second cyclic shift indicates the time domain and/or frequency domain offset information, and the first The difference in cyclic shifts of the sequences of two adjacent RBs in the resource indicates the time interval between the first reserved resource and the reference time slot.

In conjunction with the first aspect, in some implementations of the first aspect, the sequence is a sequence of any RB in the first resource, or the sequence is a sequence of the RB with the smallest index in the first resource.

Combined with the first aspect, in some implementation manners of the first aspect, the first COT shared information is carried on the PSFCH.

In conjunction with the first aspect, in some implementations of the first aspect, the first COT shared information includes N pieces of indication information, and each of the N pieces of indication information includes identification information of the terminal device and the first shared information of the terminal device. COT Resource information, N is a positive integer.

In connection with the first aspect, in some implementations of the first aspect, the identification information of the terminal device includes M terminal device identifiers, and the resource information of the terminal device sharing the first COT indicates a first time unit, and the first time unit is M The time unit that the terminal equipment corresponding to the terminal equipment identification is shared in the first COT. The channel corresponding to the first COT includes L interleaved or sub-channels. Each indication information indicates the i-th terminal equipment identification among the M terminal equipment identifications. The corresponding terminal equipment shares the i-th interlace or sub-channel of L interlaces or sub-channels, where M, L and i are all positive integers, and M is less than or equal to L.

In connection with the first aspect, in some implementations of the first aspect, the first COT sharing information also indicates that the resources shared by the second terminal device in the first COT are in line with the reserved resources of the second terminal device in the first COT. Offset in time and/or frequency domain.

Combined with the first aspect, in some implementations of the first aspect, the first COT shared information is carried in any signaling of first-order SCI, second-order SCI, MAC CE, PC-5 RRC, and RRC.

Combined with the first aspect, in some implementations of the first aspect, each time slot of the first time slot set in the first COT includes time domain resources for type2 LBT, where the first time slot set is A set of time slots for each terminal device sharing the first COT to access the first COT, or the first time slot set is a set of time slots for each terminal device sharing the first COT to transmit sidelink information, or , the first time slot set is the set of all time slots in the first COT.

Combined with the first aspect, in some implementations of the first aspect, the AGC symbols and/or GAP symbols in each time slot include time domain resources for type2 LBT.

In the second aspect, a communication method is provided. The method can be executed by a second terminal device, or can also be executed by a component (such as a chip or circuit) of the second terminal device. This is not limited. For the convenience of description, The following description takes execution by the second terminal device as an example.

Combined with the second aspect, in some implementations of the second aspect, the second terminal device sends first sideline control information to the first terminal equipment, and the first sideline control information indicates the reserved resources of the second terminal equipment; The second terminal device receives the first COT sharing information from the first terminal device. The first COT sharing information indicates whether sharing of the first COT is allowed or not. The first COT sharing information is directed to the second terminal device. The first COT is The initial COT of the first terminal device and all or part of the reserved resources of the second terminal device are located in the first COT; the second terminal device determines whether to share the first COT based on the first COT sharing information.

Combined with the second aspect, in some implementations of the second aspect, the first resource is used to transmit the first COT shared information, and the method further includes: the second terminal device determines according to the first resource whether the first COT shared information is indicated to of the second terminal device, wherein the first resource is determined based on the reserved resources of the second terminal device, or the first resource is determined based on the reserved resources of the second terminal device in the first COT, or the first resource is determined based on the reserved resources of the second terminal device in the first COT. One resource is determined based on the first reserved resource. The first reserved resource belongs to the reserved resource of the second terminal device in the first COT. The first reserved resource corresponds to a time slot in the time domain and in the frequency domain. Corresponds to a sub-channel or interlace.

Combined with the second aspect, in some implementations of the second aspect, the first reserved resource is the resource with the smallest time slot index, the smallest subchannel or the smallest interleaving index among the reserved resources in the first COT, or the first reserved resource. The reserved resource is the resource with the smallest time slot index and the largest subchannel or interleaving index among the reserved resources in the first COT, or the first reserved resource is the resource with the largest time slot index and the largest subchannel index among the reserved resources in the first COT. Or the resource with the largest interleaving index, or the first reserved resource is the resource with the largest time slot index and the smallest subchannel or interleaving index among the reserved resources in the first COT.

Combined with the second aspect, in some implementations of the second aspect, the second terminal device determines that the first COT shared information is indicated to the second terminal device according to the first resource, including: the second terminal device determines that the first resource is Time domain resources Finally, the time domain resources separated by at least the first time interval are the time domain resources of the first reserved resources; the second terminal device determines that the first COT sharing information is indicated to the second terminal device.

Combined with the second aspect, in some implementations of the second aspect, the second terminal device determines that the first COT shared information is indicated to the second terminal device according to the first resource, including: the second terminal device determines that the first resource is The frequency domain resource is the same as the frequency domain resource of the first reserved resource; the second terminal device determines that the first COT sharing information is indicated to the second terminal device.

Combined with the second aspect, in some implementations of the second aspect, the first COT sharing information is a sequence of the first resource, and the cyclic shift of the sequence indicates at least one of the following information: whether the second terminal device is allowed to share the first COT; The time interval between the first reserved resource and the reference time slot, the reference time slot is the time slot of the first resource, or the starting time slot of the first COT; the offset information in the time domain and/or frequency domain, time The offset information in the domain and/or frequency domain indicates the offset in the time domain and/or frequency domain between the resources shared by the second terminal equipment in the first COT and the reserved resources of the second terminal equipment in the first COT; The frequency domain resource of the first reserved resource.

In conjunction with the second aspect, in some implementations of the second aspect, the cyclic shift of the sequence is determined based on a first cyclic shift and a second cyclic shift, wherein the first cyclic shift indicates whether the first cyclic shift is allowed or not. The two terminal devices share the first COT, and the second cyclic shift indicates time domain and/or frequency domain offset information.

In conjunction with the second aspect, in some implementations of the second aspect, the cyclic shift of the sequence is determined based on the first cyclic shift and the second cyclic shift, wherein the cyclic shift of the sequence indicates whether the first cyclic shift is allowed or not allowed. The two terminal devices share the first COT, the first cyclic shift indicates the time interval between the first reserved resource and the reference time slot, and the second cyclic shift indicates offset information in the time domain and/or frequency domain.

In conjunction with the second aspect, in some implementations of the second aspect, the cyclic shift of the sequence is determined based on a first cyclic shift and a second cyclic shift, wherein the first cyclic shift indicates whether the first cyclic shift is allowed or not. The two terminal devices share the first COT, the second cyclic shift indicates the time interval between the first reserved resource and the reference time slot, and the third cyclic shift is the cyclic shift of the sequence of two adjacent RBs in the first resource. bit difference, the third cyclic shift indicates the offset information of the time domain and/or frequency domain offset information, or the first cyclic shift indicates whether the second terminal device is allowed to share the first COT, the second cyclic shift bit indicates time domain and/or frequency domain offset information, the third cyclic shift is the difference between two adjacent RBs in the first resource, and the third cyclic shift indicates the difference between the first reserved resource and the reference time slot. time interval.

Combined with the second aspect, in some implementations of the second aspect, the cyclic shift of the sequence of any RB in the first resource is based on the first cyclic shift, the second cyclic shift and the third cyclic shift. deterministic, among which,

The first cyclic shift indicates whether the second terminal device is allowed to share the first COT, and the second cyclic shift indicates the time between the first reserved resource and the reference time slot. interval, the difference between the third cyclic shifts of two adjacent RBs in the first resource indicates the time domain and/or frequency domain offset information, or the first cyclic shift indicates whether it is allowed or not The second terminal equipment shares the first COT, the second cyclic shift indicates the time domain and/or frequency domain offset information, and the cycle of the sequence of two adjacent RBs in the first resource The difference in shift indicates the time interval between the first reserved resource and the reference time slot.

Combined with the second aspect, in some implementations of the second aspect, the sequence is a sequence of any RB in the first resource, or the sequence is a sequence of the RB with the smallest index in the first resource.

Combined with the second aspect, in some implementation manners of the second aspect, the first COT shared information is carried on the PSFCH.

Combined with the second aspect, in some implementations of the second aspect, the first COT shared information includes N pieces of indication information, and each of the N pieces of indication information indicates the identification information of the terminal device and the terminal device shares the first COT. Resource information, N is a positive integer.

Combined with the second aspect, in some implementations of the second aspect, the identification information of the terminal device includes M terminal device identifications, the resource information of the terminal device sharing the first COT indicates a first time unit, and the first time unit is multiple A time unit shared by terminal devices in the first COT. The channel corresponding to the first COT includes L interleaved or sub-channels. Each indication information indicates the terminal device sharing corresponding to the i-th terminal device identifier among the M terminal device identifiers. The i-th interlace or sub-channel of L interlaces or sub-channels, where M, L and i are all positive integers, and M is less than or equal to L.

In connection with the second aspect, in some implementations of the second aspect, the first COT sharing information also indicates the resources shared by the second terminal device in the first COT relative to the reserved resources of the second terminal device in the first COT. Offset in the time and/or frequency domain.

Combined with the second aspect, in some implementations of the second aspect, the first COT shared information is carried in any signaling of first-order SCI, second-order SCI, MAC CE, PC-5 RRC, and RRC.

Combined with the second aspect, in some implementations of the second aspect, each time slot of the first time slot set in the first COT includes time domain resources for type2 LBT, where the first time slot set is A set of time slots for each terminal device sharing the first COT to access the first COT, or the first time slot set is a set of time slots for each terminal device sharing the first COT to transmit sidelink information, or , the first time slot set is the set of all time slots in the first COT.

Combined with the second aspect, in some implementations of the second aspect, the time domain resources for type2 LBT in each time slot are located in AGC symbols and/or GAP symbols.

Combined with the second aspect, in some implementations of the second aspect, the method further includes: the second terminal device receives the second COT sharing information, the second COT sharing information is indicated to the third terminal device, and the second COT sharing The information indicates whether to share the first COT; the second terminal device receives the second SCI from the third terminal device, and the second SCI indicates the reserved resources of the third terminal device; the second terminal device responds to the reserved resources of the third terminal device and The second COT shared information determines the first time slot set.

Combined with the second aspect, in some implementations of the second aspect, the method further includes: the second terminal device receives the second COT sharing information, the second COT sharing information is indicated to the third terminal device, and the second COT sharing The information indicates whether to share the first COT; the second terminal device determines the first time slot set according to the second COT sharing information.

Regarding the beneficial effects of the second aspect, please refer to the description of the first aspect and will not be repeated here.

In a third aspect, the present application provides a communication device. The communication device has the function of implementing the method in the first aspect or any possible implementation thereof. Functions can be implemented by hardware, or by hardware executing corresponding software. Hardware or software includes one or more units corresponding to the above functions.

In a fourth aspect, the present application provides a communication device, which has the function of implementing the method in the second aspect or any possible implementation thereof. Functions can be implemented by hardware, or by hardware executing corresponding software. Hardware or software includes one or more units corresponding to the above functions.

In a fifth aspect, the present application provides a communication device, including at least one processor, the at least one processor is coupled to at least one memory, the at least one memory is used to store computer programs or instructions, and the at least one processor is used to call from the at least one memory and run the computer program or instructions to cause the communication device to execute the method in the first aspect or any possible implementation thereof. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

In one example, the communication device may be a first terminal device. When the communication device is a first terminal device, the communication interface may be a transceiver or an input/output interface.

In another example, the communication device may be a component (eg, a chip or an integrated circuit) installed in the first terminal device. When the communication device is a chip or a chip system, the communication interface may be a Input/output interface, interface circuit, output circuit, input circuit, pin or related circuit, etc. The processor may also be embodied as a processing circuit or logic circuit.

In a sixth aspect, the present application provides a communication device, including at least one processor, the at least one processor is coupled to at least one memory, the at least one memory is used to store computer programs or instructions, and the at least one processor is used to call from the at least one memory and run the computer program or instructions to cause the communication device to execute the method in the second aspect or any possible implementation thereof. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

In one example, the communication device may be a second terminal device. When the communication device is a terminal device, the communication interface may be a transceiver or an input/output interface.

In another example, the communication device may be a component (eg, a chip or an integrated circuit) installed in the second terminal device. When the communication device is a chip or a chip system, the communication interface may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip or chip system. The processor may also be embodied as a processing circuit or logic circuit.

In a seventh aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a program code for device execution. The program code includes a program code for executing the above-mentioned first or second aspect and the first or second aspect. A method in any of the possible implementations.

An eighth aspect provides a computer program product containing instructions. When the computer program product is run on a computer, it makes it possible for the computer to execute the first aspect or the second aspect and any one of the first aspect or the second aspect. method within the method.

In a ninth aspect, a chip is provided. The chip includes a processor and a communication interface. The processor reads instructions stored in the memory through the communication interface and executes any one of the above-mentioned first aspect or second aspect and the first aspect or the second aspect. possible implementation methods.

Optionally, as an implementation manner, the chip also includes a memory, in which computer programs or instructions are stored. The processor is used to execute the computer programs or instructions stored in the memory. When the computer program or instructions are executed, the processor is used to execute The method in any possible implementation manner of the above-mentioned first aspect or second aspect and the first aspect or second aspect.

A tenth aspect provides a communication system, which includes the communication devices shown in the fifth and sixth aspects.

Description of the drawings

Figure 1 is a schematic diagram of a network architecture provided by an embodiment of the present application.

Figure 2 is a schematic diagram of the SL time slot structure.

Figure 3 is a schematic diagram of interleaving at 30KHz subcarrier spacing within a 20MHz frequency bandwidth.

Figure 4 is a schematic diagram of two different staggered drawing methods provided in this application.

Figure 5 is a schematic diagram of UE2 transmitting on the channel in an interleaved manner or a non-interleaved manner.

Figure 6 is a schematic flow chart of NR SL resource allocation mode 2.

Figure 7 is a schematic flow chart of a communication method proposed in this application.

Figures 8 to 11 are schematic diagrams of UE2 transmitting on the channel in an interleaved manner or a non-interleaved manner within two adjacent COTs.

Figure 12 is a schematic diagram of UE1 determining the time domain and/or frequency domain resources of the first resource according to the time domain and/frequency domain resources of the first reserved resource of UE2.

Figure 13 is a schematic diagram of UE1 determining the cyclic shift of the sequence of the first resource according to the frequency domain resource of the first reserved resource of UE2.

Figure 14 is a schematic diagram of UE1 determining the cyclic shift of the sequence of the first resource according to the time interval between the time domain resource of the first reserved resource of UE2 and the reference time slot.

Figure 15 is a schematic diagram of time domain resources shared by UEs for type2 LBT in the first COT.

Figure 16 is a schematic diagram of the location of time domain resources for type2 LBT in ACG, GAP, and CPE symbols.

Figure 17 is a schematic block diagram of a communication device 1000 provided by an embodiment of the present application.

Figure 18 is a schematic block diagram of a communication device 1800 provided by an embodiment of the present application.

Detailed ways

The technical solutions in this application will be described below with reference to the accompanying drawings.

The technical solutions provided by the embodiments of this application can be applied to links between network devices and terminal devices, and can also be applied to links between devices, such as device to device (device to device, D2D) links. A D2D link can also be called a sidelink (SL), where the sidelink can also be called a side link or a secondary link. In the embodiments of this application, D2D links, side links or secondary links all refer to links established between devices of the same type, and have the same meaning. The so-called link established between devices of the same type can be a link from terminal device to terminal device, a link from network device to network device, or a link from relay node to relay node. links, etc., which are not limited in the embodiments of this application. For the link between the terminal device and the terminal device, there is the D2D link defined by the 3rd generation partnership project (3GPP) version (release, Rel)-12/13, and there is also the D2D link defined by 3GPP for the Internet of Vehicles. Vehicle to everything (V2X) link. It should be understood that V2X specifically includes vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), and vehicle-to-pedestrian (V2P) direct communication. communications, and vehicle-to-network (V2N) or vehicle-to-any-entity V2X links, including Rel-14/15. V2X also includes the current 3GPP Rel-16 and subsequent versions of V2X links based on NR systems. V2V refers to communication between vehicles; V2P refers to communication between vehicles and people (including pedestrians, cyclists, drivers, or passengers); V2I refers to communication between vehicles and infrastructure, such as roadside units (road side unit, RSU) or network equipment. There is also a V2N that can be included in V2I. V2N refers to the communication between vehicles and network equipment. Among them, RSU includes two types: terminal type RSU. Since it is deployed on the roadside, this terminal type RSU is in a non-mobile state and does not need to consider mobility; base station type RSU can provide timing synchronization for vehicles communicating with it. and resource scheduling.

For example, Figure 1 is a schematic diagram of a network architecture provided by this application. Figure 1 includes 4 terminal devices and 1 network device. Any two of the four terminal devices can communicate directly with each other, and the direct communication link between the two terminal devices is the SL. It should be understood that FIG. 1 only illustrates four terminal devices, and the communication system may also include a larger number of terminal devices.

Optionally, the terminal device in the embodiment of the present application is a device used to implement wireless communication functions, such as a terminal or a chip that can be used in a terminal. Among them, the terminal can be user equipment (UE), access terminal, terminal unit, terminal station, mobile station, mobile station, remote station, remote terminal, mobile device, wireless communication in the 5G network or future evolved PLMN. Equipment, terminal agent or terminal device, etc. The access terminal may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (wireless) local loop (WLL) station, personal digital assistant (PDA), handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, vehicle-mounted device or wearable device, virtual reality , VR) terminal equipment, augmented reality (AR) terminal equipment, wireless terminals in industrial control (industrial control), wireless terminals in self-driving (self driving), wireless terminals in remote medical (remote medical) , wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home, etc. Terminals can be mobile or fixed. The terminal device in the embodiment of the present application may also be a vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit built into the vehicle as one or more components or units. The vehicle uses the built-in vehicle-mounted module, vehicle-mounted unit Modules, vehicle-mounted components, vehicle-mounted chips or vehicle-mounted units can implement the method of this application.

Optionally, the network device in the embodiment of the present application is an access device through which the terminal device wirelessly accesses the mobile communication system, including, for example, an access network (AN) device, such as a base station. Network equipment may also refer to equipment that communicates with terminal equipment over the air interface. Network equipment may include evolved base stations (evolved Node B) (also referred to as eNB or e-NodeB) in LTE systems or long term evolution-advanced (LTE-A); network equipment may also include 5G NR systems The next generation node B (gNB) in Equipment and future evolution of Public Land Mobile Network (PLMN) equipment, equipment in D2D networks, equipment in machine to machine (M2M) networks, Internet of Things (IoT) networks equipment in the PLMN network or network equipment in the PLMN network, etc. The embodiments of this application do not limit the specific technology and specific equipment form used by the network equipment.

In order to facilitate understanding of the embodiments of this application, several terms involved in this application are briefly introduced below.

(1) Unlicensed spectrum:

No application is required to communicate using licensed spectrum, and it is free. It is intended to serve as a complementary tool for operators to enhance their service offerings. Communication on unlicensed spectrum requires compliance with certain regulations, such as listen before talk (LBT) requirements, which are used to ensure access fairness among various types of UEs operating on the spectrum. SL communication on the unlicensed spectrum may be called SL-U, and NR communication on the unlicensed spectrum may be called NR-U. SL UE, NR UE, Wi-Fi UE, and Bluetooth UE can all transmit on unlicensed spectrum.

(2) Listen before talk (LBT):

In a communication system based on unlicensed spectrum deployment, each node determines its busy and idle status by the received power on the unlicensed frequency band. If the received power is less than a certain threshold, it is considered that there is no interference source on the unlicensed frequency band and is in an idle state. , only when the channel (frequency band) is idle and not occupied by other network equipment or terminal equipment, the network equipment or terminal equipment can use (seize) this channel (frequency band), and then information and data can be sent. This mechanism of listening first and sending later is called LBT, which can avoid conflicts between nodes when using unlicensed spectrum resources.

The channel access process includes type 1 (type1) LBT and type 2 LBT. Among them, type1LBT is LBT based on fallback. The fallback time is related to CAPC, and the channel needs to be idle for a long time before access. type2 LBT only requires the channel to be idle for a short period of time (such as 16us or 25us) before the UE can access the channel. It is mainly used when sharing the channel occupancy period (COT), and has corresponding execution conditions, such as initial COT. The UE (that is, the UE that seizes the COT) has a transceiver relationship with the UE that shares the COT.

(3) Initial UE and shared UE:

Initial UE: The UE of the initial COT, the UE of the initial CO, or the UE that transmits within the COT after successfully executing LBT (such as Type1LBT). The initial UE may transmit at least A time slots starting from the COT, where A is an integer. The initial UE can also transmit in any at least B time slots in the COT, or in at least C time slots before the end of the COT, where B and C are both integers. The initial UE can co-occupy the channel with other terminal equipment for a continuous period of time, that is, the initial UE shares the COT with other terminal equipment.

Shared UE: UE transmitting within the COT of the original UE. There can be one or more shared UEs. The shared UE performs LBT (such as Type2 LBT) after the transmission of the initial UE and shares the initial COT of the initial UE; or the shared UE performs LBT (such as Type2 LBT) after the transmission of other shared UEs and shares the initial COT of the initial UE. The shared UE is the receiving UE of the initial UE; or the initial UE is the receiving UE of the shared UE; or the initial UE, the first shared UE, and the second shared UE are in the same group, and the first shared UE shares the COT and sends sideline information to the second shared UE. The shared UE transmits in an interleaved manner or a non-interleaved manner within the COT.

(4)Type 1 channel access (Type 1 channel access or Type 1 SL channel access):

Type 1 channel access can also be called type1LBT. It includes 2 parts: channel sensing of length Td (defer duration) and loop sensing.

The channel sensing with length T _d consists of one T _f =16us and subsequent mp consecutive Tsl =9us, that is, T _d =T _f + _mp *T _sl . Among them, the sensing time of T _f is 9us at the beginning. When all the sensing time of T _d is idle, it enters the loop sensing. See Table 1 or Table 2 for the value of m _p , where CW _p is the contention window, CW _min,p is the minimum value of the contention window, CW _max,p is the maximum value of the contention window, W _min,p ≤CW _p ≤CW _max,p , T _cot,p is the maximum length of COT.

Loop awareness is a loop process based on counter N, including the following steps:

Step 1: Let N=N _init , where N _init is a random number ranging from 0 to CW _p . Then go to step 4;

Step 2: If N>0, the UE decides to decrease the counter value, so N=N-1;

Step 3: Sense the channel within an additional sensing slot duration. If the sensing result is idle, go to step 4; otherwise, go to step 5;

Step 4: If N=0, stop; otherwise, go to step 2;

Step 5: Sense the channel until it senses that one sensing slot in T _d is busy, or until all sensing slots in T _d are idle;

Step 6: If all sensing time slots in T _d are idle, go to step 4; otherwise, go to step 5.

Table 1

Table 2

Type 2 channel access (Type 2 channel access or Type 2 SL channel access)

Type2 channel access can also be called type2 LBT. Type 2 channel access includes three types, Type 2A, Type 2B, and Type 2C. Type2 LBT only requires the channel to be idle for a short period of time (such as 16us or 25us) before the UE can access the channel. It is mainly used when COT is shared and has corresponding execution conditions. For example, the UE of the initial COT and the UE of the shared COT mainly have a sending and receiving relationship.

Type 2A channel access: The UE transmits immediately after sensing that the channel is idle for at least the sensing interval T _short =25us. Specifically, T _short =25us is composed of one sensing time slot of T _f =16us and one sensing time slot of T _sl =9us. If both sensing slots are idle, the channel is considered idle.

Type 2B channel access: The UE transmits immediately after sensing that the channel is idle within T _f =16us. Specifically, channel sensing occurs in the last 9us of Tf, and the channel sensing time is not less than 5us. If the sensing channel is idle for more than 4us, the channel is considered idle.

Type 2C channel access: UE can transmit without channel sensing, and the transmission time is up to 584us.

(5) Channel occupancy period (COT):

Channel occupancy (CO, channel occupancy) refers to the UE's transmission on one or more channels after performing the channel access process. After the UE performs type1LBT, it occupies the channel for transmission for a continuous period of time, which is called COT. The frequency domain unit of COT is the channel, and the time domain unit is ms or time slot. In this application, COT can be a time concept, that is, the time of SL transmission; it can also be a resource concept, that is, the time-frequency resources occupied by SL transmission. CO can be a time concept, that is, the time of SL transmission; it can also be a resource concept, that is, the time-frequency resources occupied by SL transmission. The UE can transmit on multiple adjacent or non-adjacent channels. The UE's transmission on multiple channels can be understood as: the UE's transmission occupies one COT, and the COT occupies multiple channels in the frequency domain; or, the UE's transmission occupies one COT. Multiple COTs are occupied, and each COT occupies 1 channel in the frequency domain. In this application, without further distinction, COT and CO are the same concept.

The UE's transmission cannot exceed the limit of the maximum channel occupancy time (MCOT), which is recorded as T _cot,p . For different CAPCs, the values of T _cot,p are different, as shown in Table 4 or Table 5. For a UE to access the channel and transmit within the COT, the transmission time does not exceed the maximum channel occupancy time T _cot,p . For multiple UEs transmitting within a COT, the transmission time of the UE in the initial COT and the UE sharing the COT shall not exceed the maximum channel occupancy time T _cot,p . P is the CAPC of the UE of the initial COT; or, P is the CAPC with the smallest CAPC value among the UEs transmitted by COT.

(6)COT sharing:

After the UE successfully performs LBT and transmits it in the COT, it can be said that the UE has initialized the COT. For example, channel access is performed through type1LBT. The initial device that initializes the COT can occupy the channel with other devices. This process is shared by the COT. Without causing ambiguity, in this application, the UE with the initial COT is called the initial UE or the UE with the initial COT, and other UEs that jointly occupy the COT are called shared UEs or UEs sharing the COT.

In the case of COT sharing, during part of the COT time period, the initial device can send data to other devices, and during other time periods of the COT, other devices that receive the data can use the COT to send data to the initial device. Sending, a device that has not received the data sent by the initial device generally cannot use the COT to send data to the initial device.

(7) SL time slot structure composition:

As shown in Figure 2, an SL time slot includes 14 symbols (symbols), namely symbols 0 to 13. Specifically, the distribution of channels in an SL time slot is as follows, automatic gain control (AGC) distribution At symbol 0, the physical side link share channel (PSSCH) is distributed between symbols 1 and 9, and the physical side link control channel (PSCCH) is distributed between symbols 1 and 3 or symbol 1. ~Symbol 2, the physical side link feedback channel (PSFCH) is distributed between symbols 11 and 12. The PSFCH interval GAP is distributed between symbols 11 and 12, and the GAP is distributed between time slots 10 and 13. Among them, PSCCH carries first-order sidelink control information (SCI), PSSCH carries second-order SCI, medium access control control element (medium access control control element, MAC CE) and/or data, PSFCH carries feedback information.

It should be understood that Figure 2 only schematically shows a time slot structure including PSFCH in the SL time slot, and PSFCH may not be included in some SL time slot structures. Regardless of whether the time slot contains PSFCH, the first symbol of the time slot is AGC, and the last symbol is GAP. GAP can also be called a blank symbol. Among them, within a time slot, the first OFDM symbol copies the information sent on the second symbol for AGC. In addition, the UE may receive and transmit PSSCH respectively in two consecutive time slots, or the UE may receive and transmit PSSCH and PSFCH respectively in the same time slot. Therefore, after the PSSCH and after the PSFCH symbol, a GAP symbol is required for the UE's transceiver conversion.

The scheduling granularity of PSCCH and PSSCH is one time slot in the time domain, and one or more consecutive sub-channels in the frequency domain. One sub-channel consists of {10, 12, 15, 20, 25, 50, 75, 100} RB composition. A resource block (RB) refers to a frequency domain resource unit composed of 12 consecutive subcarriers. The scheduling unit of PSFCH is one symbol in the time domain and one RB in the frequency domain. In addition, RB can also be called physical resource block (PRB). Table 3 shows the number of RBs under different transmission bandwidths and different subcarrier spacing (SCS).

table 3

(8) Sub-channel and interleaving:

In SL-U, the UE can support transmission in units of subchannels in the frequency domain, or can also support transmission in an interlace manner. That is, the basic unit of frequency domain resource allocation is a sub-channel or interleave. In the application, the frequency domain unit of sidelink resources is a sub-channel or interlace. Among them, interleaving can also be recorded as interlacing, interlaced, and progressive. The interleaved mode can be understood as the UE transmitting on discontinuous RBs. The non-interleaved mode can be understood as the UE transmitting on continuous RBs, or the UE transmitting on continuous frequency domain resources, or the UE transmitting on a sub-channel, or the UE transmitting in the form of a sub-channel.

The protocol defines multiple interlaces of resource blocks, hereinafter referred to as interlaces. Interleaving m consists of common resource blocks (CRB) {m,M+m,2M+m,3M+m,...}. Where M is the staggered number, and there are m∈{0,1,...,M-1}. Optionally, the value of M is related to SCS. For example, when μ=0 (that is, the subcarrier spacing is 15 kHz), the value of M is 10. For another example, when μ=1 (that is, the subcarrier spacing is 30 kHz), the value of M is 5.

CRB The relationship with interleaved resource blocks, BWP i and interleave m satisfies: Among them, among Indicates the common resource block starting from BWP, which is the number of CBR relative to common resource block 0. The index μ may be omitted when there is no risk of confusion. The UE expects that the number of common resource blocks in the interlace contained by BWP i is not less than 10. For ease of expression, the common resource block CRB can be understood as RB.

One interleave includes N non-consecutive RBs. Optionally, the spacing between RBs within the interlace may be the same or different. For example, within one interlace, the RB interval may be M RBs. The RB interval refers to the interval from the frequency domain starting position of one RB to the frequency domain starting position of the second RB in the interleaving. For another example, within one interlace, the RB interval may be M-1 RBs. The RB interval refers to the interval from the frequency domain end position of one RB to the frequency domain starting position of the second RB.

For example, as shown in Figure 3, the horizontal axis represents the frequency domain, the unit is RB, and the vertical axis represents the time domain, the unit is symbol. Within the 20MHz frequency bandwidth and the 30KHz subcarrier spacing, there are a total of 51 RBs, that is, 51 small grids. Among these 51 resource blocks, 10 or 11 equally spaced RBs form an interleave. Specifically, 11 RBs with the label 0 are interleave 0, 10 RBs with the label 1 are interleave 1, and 10 RBs are interleave. The RB numbered 2 is interleaved 2, the 10 RBs numbered 3 are interleaved 1, and the 10 RBs numbered 4 are interleaved 4, that is, a total of 51 RBs include 5 interleaves.

For example, taking a 20MHz transmission bandwidth as an example, Table 4 lists the combinations of the number of interleaves M and the number of PRBs in the interleave N under different SCS. The combination of at least one interleave number M and the number of PRBs in the interleave N can be determined according to the configuration or preconfiguration.

Table 4

It can be seen that the RBs within a stagger are actually distributed at intervals. As shown in Figure 4, the horizontal axis in Figure 4 represents the time domain (such as 1 time slot), and the vertical axis represents the frequency domain (such as 1 channel). There are 4 interleaves in the channel, namely interleave 0, interleave 1, interleave 2, and interleave 3. Each interleave contains 4 RBs. Different UEs can transmit on different interlaces in a frequency division manner. For example, UE2 transmits on the 4 RBs corresponding to interlace 0 and the 4 RBs corresponding to interlace 1, and UE3 transmits on the 4 RBs corresponding to interlace 2. UE transmits on interlace 3. Since the left diagram of Figure 4 is relatively cumbersome, the right diagram of Figure 4 is used in this application to express the same meaning, that is, the channel contains 4 interleaves, UE1 transmits on interleave 0 and interleave 1, UE2 transmits on interleave 2, and no UE transmits on interleave 2. 3 on the transmission.

In addition, the transmission of one UE on the channel may be in an interleaved manner or in a non-interleaved manner. As shown in Figure 5, they are also transmitted on the channel. The left picture of Figure 5 shows UE2 transmitting on all interleaves of the channel in an interleaved manner. The right picture of Figure 5 shows UE2 transmitting on the channel in a non-interleaved manner. The "non-interleaved mode" can also be called a channel mode, a sub-channel mode, and a channel-occupying mode. Optionally, a full channel can be understood as occupying at least 80% of the resources in the frequency domain.

(9)OCB requirements:

The nominal channel bandwidth is the widest frequency band allocated to a single channel, including guard bands. Occupied Channel Bandwidth is the bandwidth containing 99% of the signal power. The nominal channel bandwidth of a single operating channel is 20MHz. The occupied channel bandwidth should be between 80% and 100% of the nominal channel bandwidth. For UEs with multiple transmit chains, each transmit chain shall meet this requirement. Occupied channel bandwidth can vary with time/payload. During the Channel Occupancy Time (COT, Channel Occupancy Time), the UE can temporarily transmit at less than 80% of its nominal channel bandwidth, and the minimum transmission bandwidth is 2MHz.

Interleaved transmission is to meet OCB requirements. Take 20MHz bandwidth and 30kHz SCS as an example. The transmission bandwidth has 51 RBs. If a subchannel consists of 10 RBs, there are 5 subchannels (remaining 1 RB is free). If the UE transmits on a sub-channel, the occupied bandwidth is about 4MHz, which does not meet the OCB requirement of "the occupied channel bandwidth should be between 80% and 100% of the nominal channel bandwidth". If sent in an interleaved manner, taking Figure 3 as an example, if the interleaved transmission with index 0 is used, the bandwidth occupied is about 20MHz, that is, 100% of the nominal bandwidth; if the interleaved transmission with index 1 is used, the bandwidth occupied is about 18MHz, that is, About 46/51≈90% bandwidth. Can meet the needs of OCB.

In this application, "interleaved mode" and "non-interleaved mode" are used to describe two transmission modes. The interleaved mode can be understood as the UE transmitting on discontinuous RBs. Optionally, the intervals between RBs within the interleave can be the same or different. The non-interleaved mode can be understood as the UE transmitting on continuous RBs, or the UE transmitting on continuous frequency domain resources, or the UE transmitting on a sub-channel, or the UE transmitting in the form of a sub-channel.

(10) Time unit and frequency domain unit:

Time units (or time domain resources) include symbols, slots, mini-slots, partial slots, sub-frames, and radio frames. , sensing slot, etc.

The frequency domain unit (or frequency domain resource) includes resource element (RE), RB, subchannel (subchannel), resource pool (resource pool), bandwidth (bandwidth), bandwidth part (BWP), carrier ( carrier, channel, interlace, etc.

(11) Resource pool:

NR SL communication is based on resource pool. The so-called resource pool refers to a time-frequency resource dedicated to SL communication. The frequency domain resources contained in the resource pool are continuous. The time domain resources contained in the resource pool can be continuous or discontinuous. Different resource pools are distinguished by SL-ResourcePoolID. The UE receives on the receiving resource pool and sends on the transmitting resource pool. If the resource pools have the same resource pool index, the time-frequency resources of the resource pools can be considered to be completely overlapping.

In SL-U, since the frequency band is shared by multiple forms of UE, such as SL UE, Wi-Fi UE, and Bluetooth UE transmit on the same frequency band. The SL resource pool can also be understood as a collection of resources that can be used for SL transmission. In this embodiment, the resource pool may also be called a channel, an operating channel, or a nominal channel (Nominal Channel Bandwidth) bandwidth (bandwith). That is, the resource pool, channel, and bandwidth are all used to represent the set of resources that can be used for SL transmission.

In the resource pool, the UE can transmit PSCCH and/or PSSCH on M adjacent channels, or can transmit PSCCH and/or PSSCH on one channel. Take for example that the UE transmits PSCCH on interlaces A and PSSCH on interlaces B, where A is less than or equal to B, and A and B are both integers.

For the UE to transmit on 1 channel, the UE transmits the PSCCH on the A interlace with the smallest index among the B interlaces in which the PSSCH is transmitted. For example, A=1, B=4, M=1, the interleave indexes used to transmit PSSCH are 0, 1, 2, and 3 respectively, and the UE transmits PSCCH on interlace 0.

For the UE to transmit on M adjacent channels, the UE transmits PSCCH on A interlaces on the channel with the smallest channel index; the UE transmits PSCCH on M channels and a total of B interlaces. For example, A=1, B=4, M=2, and the channel indexes are 0 and 1 respectively, then the UE transmits PSCCH and PSSCH on interleave 0 on channel 0, and transmits PSSCH on interleave 1 on channel 0; PSSCH is transmitted on interlace 0 and interlace 1 of 1.

(12)Priority:

The service priority of UE B is specifically the transmission priority of UE B. Because UE B may send multiple services at the same time, the priorities of multiple services may be different. Therefore, simply describing the priority of UE B is not very accurate.

Service priority can also be called L1 priority (L1priority), physical layer priority, priority carried in SCI, priority corresponding to PSSCH associated with SCI, sending priority, priority of sending PSSCH, used for resource selection The priority of the logical channel, the priority of the logical channel, and the highest level priority of the logical channel.

There is a certain correspondence between the priority level and the priority value. For example, the higher the priority level, the lower the priority value, or the lower the priority level, the lower the priority value. For example, the higher the priority level, the lower the priority value. The priority value range can be an integer from 1 to 8 or an integer from 0 to 7. If the priority value range is 1-8, then a priority value of 1 represents the highest level of priority.

(13) Source identification, destination identification (UE identification):

The layer 2 source identifier (Source Layer-2 ID or source L2 ID) is 24bit. The lower 8 bits (LSB part (8bits)) of the layer 2 source identifier are called the layer 1 source identifier, which is the source ID (source ID) indicated in the SCI of NR; the upper 16 bits (MSB part (16bits)) are called SRC, indicated in the MAC header of the MAC CE. The source identifier in the control information may refer to the source ID indicated in the SCI of the NR, the SRC in the MAC header, and the layer 2 source identifier. The layer 2 destination identifier (Destination Layer-2 ID or destination L2 ID) is 24 bits. The lower 16 bits (LSB part (16bits)) of the layer 2 destination identifier are called the layer 1 destination identifier, which is the destination ID (destination) indicated in the SCI of NR. ID); the upper 8 bits (MSB part (8bits)) are called DST and are indicated in the MAC header of MAC CE. The destination identifier in the control information may refer to the destination ID indicated in the SCI, the DST in the MAC header, and the layer 2 destination identifier.

There is no source identifier in the LTE SCI, only a 24-bit layer 2 source identifier, which is indicated by the SRC field in the MAC header. There is no destination identifier in the LTE SCI, only a 24-bit layer 2 destination identifier. The DST field in the MAC header indicates the layer 2 destination identifier or the high 16 bits of the layer 2 destination identifier.

In addition, destination can also be referred to generally in the agreement. Specifically, for unicast, destination represents the pair of layer 2 source identifier and layer 2 destination identifier; for broadcast and multicast, destination represents the layer 2 destination identifier.

It can be understood that identification, sequence, number, and index represent the same meaning.

(14) Sequence:

Sequences are generated by cyclic shifts of a base sequence. A base sequence can generate multiple different sequences through different cyclic shifts. The root sequence number is used to generate the base sequence. The root sequence number can also be called the root sequence index, and the base sequence can also be called the root sequence. The following is a low peak to average power ratio (low-PAPR) sequence. Take an example to illustrate.

sequence can be represented by a base sequence The cyclic shift α is defined according to the following formula (I);

In formula (I), represents the base sequence, M _ZC represents the length of the base sequence, and the cyclic shift α in formula (I) can be described by formula (II);

In formula (II), m _CS is the cyclic shift value on the length N _CS . Alternatively, m _CS can also be called the cyclic shift value of the sequence.

Among them, the base sequence It can be a ZC sequence. Assuming that the length of the ZC sequence M _ZC is equal to 12, then It can be expressed by formula (III).

Table 5 below shows the sum of u in formula (III) when M _ZC is equal to 12 value. where u can be called the base sequence root serial number.

table 5

Among them, a in the above formula is an integer, such as 0, 1, 2, etc. floor() means rounding down the input variable; x _n is the intermediate variable; It is a predefined or configured value, such as 12; It is the total number of all frequency domain RBs and/or the total number of frequency domain RBs and sequence cyclic shifts in a set of feedback resources; It is the number of cyclic shift pairs configured on the sidelink feedback channel PSFCH, such as 1, 2, 3, 4, 6, etc.

Optionally, Mi is the identity of the receiving data channel, and its identity may be indicated by the upper layer protocol (is the identity of the UE receiving the PSSCH as indicated by higher layers).

In addition, m ₀ in the above formula is the first cyclic shift value, and m _cs is the second cyclic shift value. The value of cyclic shift α _l can be determined by m ₀ , m _cs and min _int . For example: α _l is equal to (m ₀ +m _cs + min _int ), or determined by the following formula (0-4):

Any of the cyclic shifts determined in the embodiment of the present application may be the first cyclic shift m ₀ in the above formula, the second cyclic shift m _cs , or the third cyclic shift min _int , it can also be a cyclic shift α.

(13)NR SL resource allocation mode

According to the different resource allocation subjects, resource allocation (RA) in SL transmission can be divided into two modes: mode 1 and mode 2. In Mode 1, the time-frequency resources used for SL transmission are centrally scheduled by network equipment; in Mode 2, the time-frequency resources used for SL transmission are determined by the terminal equipment. Resource allocation mode 2 is briefly introduced below.

As shown in Figure 6, in Mode 2, a time point and two important windows are defined:

This time point refers to a time slot in which the higher layer of the terminal equipment triggers resource selection for the transmission of PSCCH and/or PSSCH. As shown in Figure 6, this time slot may be called time slot n.

One of the two important windows is the sensing window, which refers to the window used by the terminal device to sense the time-frequency resource occupancy around it. For example, it may correspond to the time slot range in Figure 6, where is a value calculated based on high-level parameters, a value defined by a standard, or a value based on the capabilities or implementation of the terminal device, or based on high-level parameters. The calculated value. Among them, the implementation method of the terminal device may refer to the specific software algorithm and hardware implementation of the terminal (such as the computing chip, communication chip, storage chip, vehicle chip, vehicle module, etc. used by the terminal).

The other window among the two important windows is the selection window, which refers to the window used by the terminal device to select candidate single-slot resources (resources for short) based on the sensing results within the sensing window. For example, it may correspond to the time slot range in Figure 2, where is a value obtained according to the implementation of the terminal device, and is a value obtained according to high-layer parameters or the implementation of the terminal device.

Based on the above description, the basic process of resource allocation mode 2 can be summarized as the following steps:

Step 1. In time slot n, the higher layer of the terminal equipment triggers to select time-frequency resources for the transmission of PSCCH and/or PSSCH and provides higher layer parameters;

Optionally, the higher layer parameters include the identification of the resource pool used when sending the PSCCH and/or PSSCH, the sending priority of the primary PSCCH and/or PSSCH, and the number of subchannels used when sending the PSCCH and/or PSSCH. Count etc.

Step 2: The terminal device listens to the SCI sent by other terminal devices using the resource pool indicated in step 1 within the sensing window;

Step 3. Based on the listening result of Step 2, the terminal device senses the usage of the time-frequency resources in the resource pool within the selection window, and determines the available candidate single-slot resource set. In the available candidate single-slot resource set, Excluding time-frequency resources reserved for use by other terminal devices or that may be occupied by other terminal devices, the resources in the candidate single-slot resource set can also be called reserved resources;

Step 4: The terminal equipment determines the time-frequency resources used for PSCCH and/or PSSCH transmission according to the available candidate single slot resource set.

Exemplarily, Figure 6 is a schematic diagram in which the terminal device determines candidate single-slot resources based on the listening results within the sensing window in the above step 3, where UE1, UE2 and UE3 are other terminal devices except the terminal device, SCI1 It is the SCI of UE1 heard by the terminal device within the sensing window. SCI1 indicates that UE1 has reserved part of the time-frequency resources within the selection window, then the terminal device can exclude the time-frequency resources that have been reserved by UE1. In the same way, SCI2 is the SCI of UE2, and SCI3 is the SCI of UE3. The terminal device can exclude time-frequency resources that have been reserved by UE2 and UE3 based on SCI2 and SCI3 respectively, thereby determining available candidates among the remaining resources in the resource selection window. Single slot resource collection.

It can be seen from the above that when multiple terminal devices communicate on the unlicensed spectrum through side links, the UE of the initial COT has exclusive use of the channel, and other UEs that have not competed for frequency domain resources cannot use the frequency domain resources. In NR-V2X, the time domain unit of resources is a time slot, and non-adjacent time slots can be selected to transmit sidelink information. However, in SL-U, the terminal device with the initial channel occupancy period (COT) needs to transmit continuously within the COT, or continuously transmit for a period of time within the COT with other terminal devices sharing the COT. If not Continuous transmission will cause COT interruption, that is, the terminal device of the initial COT will no longer be able to continue to use the COT. Therefore, in order to allow the transmission of the initial COT terminal device and the transmission of other terminal devices to form continuous transmission, how the initial COT terminal device determines which terminal devices can share its initial COT has become an urgent problem to be solved.

In view of this, this application proposes a method that can effectively solve the above technical problems. The method will be introduced in detail below with reference to Figure X.

As shown in Figure 7, Figure 7 is a schematic flow chart of a communication method proposed by this application. The method may include the following steps.

S701, UE2 sends the first SCI to UE1. The first SCI indicates the reserved resources of UE2. Correspondingly, UE1 receives the first SCI sent by UE2. Optionally, SX01 can also be understood as UE2 sending the first SCI. Correspondingly, other UEs in the resource pool including UE1 can sense, monitor, receive or decode the first SCI of UE2.

Optionally, the first SCI displays or implicitly indicates the interval information, frequency domain resource information, time domain resource information, and priority information of the reserved resources of UE2. The reserved resources indicated by the first SCI include retransmission reserved resources of UE2, periodic reserved resources, and retransmission reserved resources of periodic reserved resources. For example, the retransmission reserved resources of UE2 are indicated through the frequency domain resource information and the time domain resource information; and/or the periodic reserved resources of the resource where the first SCI is located are indicated through the interval information; and/or the periodic reserved resources of the resource where the first SCI is located are indicated through the interval information and the frequency domain resource information. The resource information and time domain resource information indicate the retransmission reserved resources of periodic reserved resources.

The reservation interval information may also be periodic reservation interval information; the frequency domain resource information includes at least any one of the following information: transmitting PSCCH and/or PSSCH in an interleaved manner, the starting position of the interleave, the number of interleaves, and non- The PSCCH and/or PSSCH, the starting position of the sub-channel, and the number of sub-channels are transmitted in an interleaved (such as channel) manner; the time domain resource information includes at least any one of the following information: one or more are transmitted on discontinuous time slots one or more initial transmissions and/or retransmissions, time interval information for one or more initial transmissions and/or retransmissions, one or more initial transmissions and/or retransmissions, initial transmissions and/or retransmissions on consecutive time slots Transmission number information; priority information includes physical layer priority and/or channel access priority class (CAPC).

S702: UE1 determines that some or all of the reserved resources of UE2 are located in the first COT, and the first COT is the initial COT of UE1.

Optionally, as shown in Figures 8, 9, 10, and 11, the first SCI of UE2 indicates reserved resources within a COT and/or reserved resources across COTs. UE2 may indicate reserved resources for the next transmission in the previous transmission. Among them, UE1=>... means that UE1 can use the corresponding resources to send SL information to other UEs, and UE2=>UE1 means that UE2 can use the corresponding resources to send SL information to UE1.

Optionally, the transmission method of UE2 in the current COT is the same as the transmission method in the previous COT; or, the transmission method of UE2 in the next COT is the same as the transmission method in the current COT. Optionally, UE1 can determine the transmission mode of the reserved resource indicated by the first SCI based on the transmission mode of the resource where the first SCI of UE2 is located; or, UE1 can determine the transmission mode of the resource where UE2 is located based on the transmission mode of the resource where the first SCI is located. The transmission method of reserved resources indicated by the first SCI. The transmission method includes an interleaved transmission method and/or a non-interleaved transmission method. As shown in Figure 8, UE2 shares the initial COT of UE1. The first SCI of UE2 indicates reserved resources. UE2 transmitted in an interleaved manner in the last transmission, and UE2 still transmits in an interleaved manner in the next transmission. As shown in Figure 9, UE2 shares the initial COT of UE1 in both transmissions. The first SCI of UE2 indicates reserved resources. The last transmission was transmitted in channel mode (non-interleaved mode), and UE2 still uses channel mode (non-interleaved mode) in the next transmission. non-interleaved mode) transmission. As shown in Figure 10, UE2 shares the initial COT of UE1 in both transmissions. The first SCI of UE2 indicates reserved resources. UE2 transmitted in an interleaved manner in the last transmission. UE2 still uses the initial COT of UE1 in the next transmission. Transmitted in an interleaved manner. As shown in Figure 11, UE2's own initial COT, UE2's first SCI indicates reserved resources, UE2 transmitted in channel mode (non-interleaved mode) in the last transmission, UE2 still uses the channel in the next transmission in UE1's initial COT mode (non-interleaved mode) transmission. After UE1 successfully performs channel access, it transmits in the first COT. It should be noted that the order in which UE1 performs the channel access process and UE2 sends the first SCI is not specifically limited in this application.

Optionally, UE2's first SCI indication requests UE1 for channel access and/or requests transmission within UE1's initial COT. For example, a field in UE2's first SCI indicates a request for UE1 channel access and/or a request for transmission within UE1's initial COT.

For example, UE2 may first send the first SCI, which indicates requesting UE1 for channel access and/or requesting transmission within UE1's initial COT, and then UE1 performs channel access and initializes the first COT. It can also be understood that the first SCI of UE2 triggers UE1 to perform channel access; or the first SCI of UE2 triggers UE1 to initiate the first COT.

For example, UE1 uses the CAPC information indicated by the first SCI of UE2 to perform type1 channel access and initialize the first COT.

For example, UE1 may first perform channel access, and then UE2 sends the first SCI, and the first SCI request is transmitted within the first COT of UE1. Optionally, UE1 successfully accesses the channel and initiates the first COT, and UE2 transmits within the first COT.

It should be understood that after UE1 initializes the first COT, UE1 may transmit SL information on the first COT. SL information includes UE1's control information (such as PSCCH), data information (such as PSSCH), feedback information (such as PSFCH), etc.

S703: UE1 sends first COT sharing information to UE2, where the first COT sharing information indicates whether sharing of the first COT is allowed or not. Correspondingly, UE2 receives the first COT shared information from UE1.

It should be understood that UE1 allows UE2 to share the first COT means that UE1 allows UE2 to share resources in the first COT. The specific resources in the first COT that can be shared will not be described here, and will be explained in detail below.

Among them, UE1 allows UE2 to share the first COT including: UE2 meets the regulatory conditions for sharing the first COT, and UE1 allows UE2 to share the first COT. There are two situations in which UE1 does not allow UE2 to share: one is that UE2 meets the legal conditions for sharing the first COT, but UE1 does not allow UE2 to share the first COT; the other is that there is no sharing relationship. The non-sharing relationship includes: UE2 does not meet the legal conditions for sharing the first COT, and UE1 does not allow UE2 to share the first COT. Among them, UE2 meeting the regulatory conditions for sharing the first COT means that there is a sending and receiving relationship between UE1 and UE2. For example: UE1 is the receiving UE of UE2; or UE2 is the receiving UE of UE1. For another example: UE1 (initial UE), UE2 (shared UE), and UE3 (shared UE) are in the same group, UE2 shares the first COT, and UE3 is the receiving UE of UE2.

Optionally, the preconfiguration or network configuration of the first COT sharing information indicates that UEl is allowed to share the first COT or not allowed to share the first COT; or the preconfiguration or network configuration of the first COT sharing information indicates that UEl One of three options: allowing sharing of the first COT, meeting the legal conditions for sharing the first COT and not allowing sharing of the first COT, or having no sharing relationship.

Optionally, when the first COT sharing information indicates that sharing the first COT is allowed, the first COT sharing information triggers UE2 to perform Type2 channel access, and UE2 transmits within the first COT initialized by UE1 according to the first COT sharing information.

It should be understood that UE1 can also share the first COT with other UEs except UE2, and other UEs perform the same actions as UE2, which will not be described again here. In the following description, the other UEs sharing the first COT are referred to as UE3.

It should also be understood that the reserved resources of UE2 and UE3 in the first COT may not overlap or may overlap. Optionally, the overlap is full overlap or partial overlap.

Optionally, if there is no overlap, the first COT sharing information indicates that COT sharing is allowed, and UE2 uses UE2's reserved resources in the first COT to perform sidelink transmission.

Optionally, the first COT sharing information indicates that sharing of the first COT is not allowed, and UE2 does not share the first COT, that is, UE2 does not transmit within the first COT.

Optionally, the first COT sharing information indicates that UE2 has no sharing relationship, so regulations do not allow UE2 to share UE1's initial COT.

Optionally, the reserved resources of UE2 and UE3 in the first COT overlap, and UE1 indicates that neither UE2 nor UE3 is allowed to share the first COT, or UE1 indicates that one of UE2 and UE3 is allowed to share the first COT. For example, it is indicated that the UE with a smaller priority value or a higher level among UE2 and UE3 is allowed to share the first COT.

Optionally, the first COT shared information can be carried in any of the signaling such as PSFCH, first-order SCI, second-order SCI, MAC CE, PC-5 RRC, and RRC. It should be noted that since the number of bearer bits of PSFCH is limited, it cannot be explicitly indicated that the first COT shared information is sent to UE2 compared with other signalings mentioned above.

The following describes in detail how UE1 sends the first COT shared information to UE2 when the first COT shared information is carried on the PSFCH.

Optionally, the PSFCH carrying the first COT shared information and the PSFCH carrying feedback information have different formats, occupy different time domain resources and/or occupy different frequency domain resources and/or occupy different sequences. Which method is used is (pre)configured.

Optionally, the PSFCH carrying the first COT shared information includes: using a new PSFCH format to carry COT shared information; or using a PSFCH format different from carrying HARQ to carry COT shared information; or using a different PSFCH format to carry collision indication (conflict indication). )'s PSFCH format carries COT shared information.

Optionally, the PSFCH that carries the first COT shared information: uses the resources in the PRB set that are not used to transmit HARQ on the PSFCH channel to carry the COT shared information; and/or uses the resources in the PSFCH channel that are not used to transmit the collision indication. The resources in the PRB set carry COT shared information.

Optionally, the PSFCH that carries the first COT shared information: uses PSFCH symbols that are not used to transmit HARQ to carry the COT shared information; and/or uses PSFCH symbols that are not used to transmit the collision indication to carry the COT shared information.

Optionally, the PSFCH carrying the first COT shared information: uses a cyclic shift of a sequence not used to transmit HARQ to indicate COT shared information; and/or uses a cyclic shift of a sequence not used to transmit collision indication to bear COT shares information.

Optionally, UE1 may implicitly indicate that the first COT shared information is by sending at least one of the time domain position of the first resource of the PSFCH, the frequency domain position of the first resource, or the cyclic shift of the sequence of the first resource. Sent to UE2. Correspondingly, UE2 may determine that the first COT shared information is sent to itself through at least one of the time domain position of the first resource, the frequency domain position of the first resource, or the cyclic shift associated with the first resource.

Alternatively, UE1 can determine the first resource according to the reserved resources of UE2; or, UE1 can determine the first resource according to the reserved resources of UE2 in the first COT; or, UE1 can determine the first resource according to the reserved resources of UE2. The reserved resources in a COT determine the first resource; or, UE1 determines the first resource according to the first reserved resource, the first reserved resource belongs to the reserved resource of UE2 in the first COT, and the first reserved resource is Corresponds to a time slot in the domain, and corresponds to a sub-channel or interleave in the frequency domain. Optionally, the frequency domain resources of UE2's reserved resources in the first COT include one or more interlaces or sub-channels.

Optionally, the first reserved resource may be the resource with the smallest time slot index and the smallest subchannel or interleaving index among the reserved resources of UE2, or the first reserved resource may be the smallest time slot index among the reserved resources of UE2, The resource with the largest subchannel or interleaving index, or the first reserved resource is the resource with the largest time slot index among the reserved resources of UE2, and the resource with the largest subchannel or interleaving index, or the first reserved resource is the reserved resource of UE2 The resource with the largest time slot index and the smallest subchannel or interleaving index. Several methods for determining the first resource according to the first reserved resource of UE2 are given below.

Method 1: UE1 determines the frequency domain resource of the first resource according to the frequency domain of the first reserved resource of UE2.

Optionally, the frequency domain resource of the first resource is the frequency domain resource of the first reserved resource.

Optionally, the frequency domain resource of the first resource is an interlace or an RB in the frequency domain resource of the first reserved resource.

Optionally, the frequency domain resource of the first resource is determined to be an interlace or an RB among the frequency domain resources of the first reserved resource through the identification information of UE2. For example, (P _ID +X) mod R is satisfied, where P _ID is the identification information of UE2, and R is the number of resources that can be used for a first COT sharing indication. The number R of resources that can be used for a first COT sharing indication is related to the interleave number or sub-channel number of the first reserved resource, and may be, for example, an integer multiple of the interleave number or the sub-channel number. The identification information of UE2 may be at least any one of: source identification information of UE2, destination identification information of UE2, device identification information of UE2, or group identification information of UE2.

As an example, as shown in Figure 12, the first COT of UE1 includes 4 time slots, namely time slot 1 to time slot 4, and the first COT corresponds to 4 interleaves in the frequency domain, namely interlace 0 to interlace 3. UE2 and UE3 have reserved resources located in the first COT. Among them, the reserved resources of UE2 include 2 different resources, namely resource #1 corresponding to time slot 3 and interleave 0, and resource #2 corresponding to time slot 3 and interleave 1. The reserved resources of UE3 include 2 different resources. They are resource #3 corresponding to time slot 4 and interleave 0, and resource #4 corresponding to time slot 4 and interleave 1. Among them, UE1=>... means that UE1 can use the corresponding resources to send SL information to other UEs, UE2=>UE1 means that UE2 can use the corresponding resources to send SL information to UE1, and UE3=>UE1 means that UE3 can use the corresponding resources to send SL information to UE1. Send SL message. For ease of explanation, here we assume that the first reserved resource of UE2 is the resource with the smallest slot index and smallest interleaving index among the reserved resources of UE2 (that is, the first reserved resource is resource #1). Specifically, how to determine the first resource is explained.

For example, as shown in Figure 12, the frequency domain location of the first reserved resource of UE2 is interlace 0. Therefore, UE1 determines that the frequency domain resource of the first resource is also interlace 0.

Method 2: UE1 determines the time domain location of the first resource based on the time domain location of the first reserved resource of UE2.

UE1 determines the time domain location of the first resource based on the time domain location of the first reserved resource of UE2 and the first time period.

Optionally, the time domain location of the first resource belongs to a COT sharing indication time domain location set, and the time domain locations in the COT sharing indication time domain location set are discretely distributed (for example, periodically distributed). The time domain positions of these discrete distributions (eg, periodic distributions) may also be called PSFCH opportunities, such as PSFCH opportunities for sending COT sharing indications.

Optionally, the time domain position of the first resource is the first time domain position before the time slot of the first reserved resource and before the first time interval from the time slot of the first reserved resource.

Optionally, the value of the first time interval is preconfigured or configured by the network, and the value is at least any one of 0, 1, 2, 3, 4, 5, 9, and 17 time slots.

For example, UE1 sends PSFCH on the PSFCH opportunities included in the time slots of at least the first time interval (for example, 0, 1, and 2 time slots) before the time slot of the first reserved resource of UE2. It should be noted that when using this method, the value of the first time interval needs to be pre-configured or configured by the network. UE1 and other UEs sharing the first COT determine whether the first COT shared information is an indication based on the same length of the first time interval. For yourself. For example, UE1 sends the first COT sharing information on the first or last PSFCH opportunity in the time slot spaced by the first time interval before the time slot of the first reserved resource.

For example, as shown in Figure 12, the time domain position of the first reserved resource of UE2 is time slot 3, and the agreed first time interval is 0 time slots. Then UE1 determines the first time slot of UE2 before time slot 3. The PSFCH is sent on the PSFCH opportunity included in the time slot (that is, the time domain resource of the first resource is time slot 2).

However, it should be noted that UE2 may not be able to determine that the PSFCH is sent to itself based on method one or method two alone. Method 1 is taken as an example to illustrate the reason. As shown in Figure 12, although the interleaving of the first resource and the interleaving of UE2 are the same interleaving, since both UE2 and UE3 have reserved resources on interleaving 0, UE2 only It cannot be determined based on the interleave 0 of the first resource whether the PSFCH sent on the first resource is sent to itself.

For example, UE1 may determine the frequency domain resource of the first resource through implementation manner 1, and determine the time domain resource of the first resource through other methods outside this application. Correspondingly, UE2 determines through implementation method 1 that the first COT sharing information sent on the first resource is indicated to the UE with the same frequency domain resource as its own, and UE2 determines the first COT shared information sent on the first resource according to other methods outside this application. The COT shared information is indicated to the UE with the same time domain resource as its own, thereby determining that the first COT shared information sent on the first resource is for itself.

For example, UE1 can determine the time domain resource of the first resource through implementation method 2, and determine the frequency domain resource of the first resource through other methods outside this application. Correspondingly, UE2 determines through method 1 that the first COT shared information sent on the first resource is directed to the UE with the same time domain resource as its own, and UE2 determines the first COT shared information sent on the first resource according to other methods outside this application. The COT sharing information is indicated to the UE with the same frequency domain resource as itself, thereby determining that the first COT sharing information sent on the first resource is for itself.

In a specific implementation manner, UE1 can jointly determine the time domain resource and frequency domain resource of the first resource through implementation method 1 and implementation method 2. Correspondingly, when UE2 receives the PSFCH on the first resource, determine the frequency domain resource of the first resource. The domain resource is the same as the frequency domain resource of the first reserved resource, and the time slot of the time domain resource of the first resource with a backward time interval of 0 (i.e., slot 3) is the time slot where the first reserved resource is located, Therefore, UE2 can determine that the PSFCH is sent to itself, that is, determine that the first COT shared information in the PSFCH is directed to itself.

The above method 1 and method 2 clarify how UE1 indicates the PSFCH to UE2. Next, continue to explain how UE1 indicates whether UE2 is allowed to share the first COT.

Optionally, the first COT sharing information is a sequence of PSFCH, that is, UE1 can indicate whether sharing of the first COT is allowed through the sequence of PSFCH.

The cyclic shifts of the PSFCH sequence include 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11. For example, when the cyclic shift of the PSFCH sequence is any one of {0,1,2,3,4,5}, it means that UE2 is allowed to share the first COT, and the cyclic shift of the PSFCH sequence is {6,7 Any one of ,8,9,10,11} means that UE2 is not allowed to share the first COT or has no sharing relationship. For example, when the cyclic shift of the PSFCH sequence is any one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, it means that UE2 is allowed to share the first COT, and the PSFCH The cyclic shift of the sequence is any one of {10,11}, indicating that UE2 is not allowed to share the first COT or has no sharing relationship.

It can be understood that the sequence of the PSFCH may also be called in this application: the cyclic shift associated with the PSFCH, the sequence of the first resource, the cyclic shift associated with the first resource, the sequence of the first COT shared information, and the first COT shared information. The cyclic shift of the sequence and the cyclic shift of the first COT shared information association. In the following, the above concepts can be replaced with each other. Optionally, in addition to indicating whether to share the first COT, the cyclic shift associated with the PSFCH may also indicate the frequency domain resource of the first reserved resource and/or the time interval between the first reserved resource and the reference time slot. How to indicate the location of the first reserved resource and/or the time interval between the first reserved resource and the reference time slot is described in detail in methods three and four below.

Optionally, the reference time slot may be: the starting time slot of the first COT, the first complete time slot of the first COT, the first valid time slot of the first COT, and the first PSCCH transmission time slot of the first COT. At least any one of the time slot and the time slot in which the first COT shared information is located (that is, the time slot of the first resource). Optionally, the preconfigured or network configured reference time slot is at least any one of the above.

Optionally, the cyclic shift associated with the PSFCH is the cyclic shift associated with the i-th interleaved RB where the first COT shared information is located.

Method 3: UE1 determines the cyclic shift associated with the PSFCH according to the frequency domain position of the first reserved resource of UE2. That is, in this method, in addition to indicating whether to share the first COT, the cyclic shift associated with the PSFCH can also indicate the frequency domain resource of the first reserved resource.

The frequency domain resource of the first reserved resource is an interlace or a sub-channel. UE1 determines the cyclic shift associated with the PSFCH according to the interleaving index or sub-channel index of the first reserved resource of UE2.

Optionally, the cyclic shift associated with the PSFCH is the frequency domain resource of the first reserved resource.

Optionally, the cyclic shift associated with the PSFCH is determined through the frequency domain resource of the first reserved resource and the identification information of UE2. For example, (P _ID +X) mod R is satisfied, where P _ID is the identification information of UE2, and R is the number of resources that can be used for a first COT sharing indication. The number R of resources that can be used for a first COT sharing indication is related to the interleave number or sub-channel number of the first reserved resource, and may be, for example, an integer multiple of the interleave number or the sub-channel number.

The identification information of UE2 may be: at least any one of the source identification information of UE2, the destination identification information of UE2, the device identification information of UE2, or the group identification information of UE2.

For example, as shown in Figure 13, the frequency domain position of the first reserved resource of UE2 is interlace 0. Therefore, UE1 determines that the cyclic shift associated with the PSFCH is 0.

It should be noted that the frequency domain position of the first resource in Figure 13 is not necessarily interlace 1, but can also be any of interlaces 0, 2, and 3, as long as the cyclic shift associated with the PSFCH is 0.

Optionally, the cyclic shift associated with the PSFCH may be the cyclic shift associated with any RB in the interlace in which the first COT shared information is located and the interleave in which the first COT shared information is located.

Method 4: UE1 determines the PSFCH sequence based on the time domain position of the first reserved resource of UE2 and the time interval between the first reserved resource and the reference time slot. That is, in this method, in addition to indicating whether to share the first COT, the cyclic shift associated with the PSFCH can also indicate the time interval between the first reserved resource and the reference time slot. For the meaning of the reference time slot, see the description in Method 2.

For example, as shown in Figure 14, UE1 determines to send PSFCH in time slot 2, and the reference time slot is the time slot in which UE1 sends PSFCH. Since the time domain resource of the first reserved resource (time slot 3) is different from the reference time slot (time slot) The time interval between slot 2) is 0 slots, therefore, UE1 determines that the cyclic shift associated with the PSFCH is 0.

Optionally, any of the cyclic shifts {0, 1, 2, 3, 4, 5} associated with the PSFCH indicates that the first COT is allowed to be shared, and indicates the distance between the first reserved resource and the reference time slot. time interval.

It should be noted that, for the same reason as using Method 1 or Method 2 alone, UE2 may not be able to determine that the PSFCH in the first resource is sent to itself when using Method 3 or Method 4 alone. Therefore, the methods given above can be used in combination to accurately indicate that the PSFCH is sent to UE2. As an example, methods one and four can be used in combination. For example, preconfiguration or network configuration uses one of method one or method three to determine the frequency domain resource of the first resource. For another example, preconfiguration or network configuration uses one of method two or method four to determine the time domain resource of the first resource. By way of example, actions that UE1 and UE2 may perform are described in detail below with reference to Figure 14 .

UE1 allows UE2 to share the first COT. UE1 determines the first resource and informs UE2 of the sharing information. Specifically, as shown in Figure 14, UE1 determines that UE2's first reserved resource is the resource corresponding to time slot 3 and interlace 0. UE1 According to the frequency domain resource of the first reserved resource of UE2, the frequency domain resource of the first resource is determined to be interlace 0. UE1 determines to send the PSFCH in time slot 2 (that is, the time domain resource of the first resource is time slot 2), referring to the time slot This is the time slot for UE1 to send the PSFCH. Since the time interval between the time domain resource of the first reserved resource (time slot 3) and the reference time slot (time slot 2) is 0 time slots, UE1 determines the time slot associated with the PSFCH. The cyclic shift is 0, which also indicates that UE2 is allowed to share the first COT. UE1 sends the PSFCH on the first resource. Correspondingly, UE2 receives the PSFCH on the first resource. UE2 determines that the frequency domain resource of the first resource is interleaved 0, the time domain resource is time slot 2, and the cyclic shift is determined to be 0. Time domain resource slot 2 of a resource is followed by time slot 3, which is 0 time slots away. The resources corresponding to interleave 0 and time slot 3 are the first reserved resources of UE2. Therefore, UE2 determines that UE1 allows itself to share the first COT.

It should be noted that in the above method, UE2 sharing the first COT means that UE2 can share the part of resources located in the first COT and belonging to the reserved resources of UE2.

In the above technical solution, PSFCH carries the first COT shared information. Compared with other signaling (such as first-order SCI, second-order SCI, MAC CE, RRC, PC5 RRC), the signaling overhead and delay are small. Since the number of bearer bits of the PSFCH is limited, at least one of the time domain position, frequency domain position, or cyclic shift of the PSFCH is sent to implicitly indicate whether which UE is allowed to use the COT of UE1. Since UE2 knows the time-frequency location of its reserved resources, it can determine that the PSFCH is sent to itself based on at least one of the time domain location, frequency domain location, or associated cyclic shift of the PSFCH.

Optionally, if there is no overlap, UE1 may indicate whether UE2 is allowed to share the first COT according to the above method. However, when the reserved resources of UE2 and UE3 overlap in the first COT, if the above method is used to simultaneously instruct two terminal devices to share the first COT, then, if UE2 and UE3 use the overlapping reserved resources to transmit data at the same time, then, Can cause transmission collisions.

Optionally, the reserved resources of UE2 in the first COT overlap with the reserved resources of UE3 in the first COT. UE1 can indicate that neither UE2 nor UE3 is allowed to share the first COT according to the above method, or UE1 can indicate that UE2 and UE3 are not allowed to share the first COT. One UE among UE3 is allowed to share the first COT, for example, indicating that the UE with a smaller priority value or a higher level among UE2 and UE3 is allowed to share the first COT.

It can be seen that when the reserved resources of UE2 and UE3 in the first COT overlap, the above method cannot be used to simultaneously instruct UE2 and UE3 to share the first COT. In view of this, this application provides a method that can solve the above problems.

In this method, when UE1 instructs UE2 and UE3 to share the first COT, the reserved resources of UE2 or UE3 in the first COT can be offset in the time domain and/or frequency domain to ensure that UE2 and UE3 are in the first COT. The resources shared within the COT will not overlap. In this way, UE1 can simultaneously instruct UE2 and UE3 to share the first COT, and the shared resources will not conflict. It should be noted that UE1 instructs UE3 and UE2 in the same manner, and UE2 is still used as an example below. Then, on the basis of the above method, the cyclic shift of the PSFCH in this method can also indicate the time domain and/or frequency domain offset information of UE2, and the time domain and/or frequency domain offset information indicates that UE2 is in the first The offset of the resources shared within the COT relative to the resources reserved by UE2 in the first COT in the time domain and/or frequency domain.

Optionally, the offset information in the time domain and/or frequency domain includes an offset in the time domain of the resources shared by UE2 in the first COT relative to the reserved resources of UE2 in the first COT.

Optionally, the offset information in the time domain and/or frequency domain includes an offset in the frequency domain of the resources shared by UE2 in the first COT relative to the reserved resources of UE2 in the first COT.

Optionally, the offset information in the time domain and/or frequency domain includes an offset in the time domain and frequency domain of the resources shared by UE2 in the first COT relative to the reserved resources of UE2 in the first COT.

Several specific implementation methods are given below. It should be understood that the following implementation will not describe in detail how UE2 determines that the PSFCH is sent to itself. For specific methods, please refer to the descriptions in Methods 1 to 4 above. The following mainly describes how UE1 indicates to UE2 through the cyclic shift associated with the PSFCH. Time domain and/or frequency domain offset information.

Implementation method one:

UE1 determines the cyclic shift m associated with the PSFCH, which is equal to the sum of the first cyclic shift m1 and the second cyclic shift m2, where the first cyclic shift m1 indicates whether UE2 is allowed to share the first COT, and the first cyclic shift m1 indicates whether UE2 is allowed to share the first COT. The two-cyclic shift m2 indicates offset information in the time domain and/or frequency domain.

Optionally, m1=i×Δ, i indicates whether UE2 is allowed to share the first COT, i={0,1}, Δ is an integer, which can be a constant, preconfigured or network configured value. For example, Δ=6.

Optionally, m2=j×Δ, j indicates the offset information in the time domain and/or frequency domain, j={0,1,2,3,4,5}, Δ is an integer, which can be a constant, a preset Configuration or network configuration value. For example, Δ=1. It should be noted that in this embodiment, the cyclic shift m uniquely corresponds to a first cyclic shift m1 and a second cyclic shift m2. In other words, m1 and m2 corresponding to a value of m are determined.

Optionally, the time domain and/or frequency domain offset information includes at least any one of the following information: offset A time slots forward in the time domain relative to the reserved resources (ie, change to the time slot index value). A small offset of A time slots), an offset of B time slots backward relative to the reserved resources in the time domain (that is, an offset of A time slots toward a larger timeslot index value), and an offset of B time slots relative to the reserved resources. The frequency domain is shifted upward by C interlaces (i.e., the interleaving index value becomes larger by A time slots), and relative to the reserved resources, the frequency domain is shifted downward by D interlaces (i.e., the interleaving index value becomes larger). small offset A time slots). Among them, A, B, C, and D are integers.

For example, the cyclic shift m (0 to 11) associated with PSFCH can be divided into two groups, as follows:

Example 1:

m1=0 indicates that the first COT is allowed to be shared, and m1=6 indicates that the first COT is not allowed to be shared. It should be noted that in actual application, the reverse is also possible, that is, m1=0 indicates that the first COT is not allowed to be shared, and m1=6 indicates that the first COT is allowed to be shared. In the following examples, m1=0 indicates that sharing of the first COT is allowed, and m1=6 indicates that sharing of the first COT is not allowed.

m2=0,1,2,3,4,5 respectively indicate offset information in the time domain and/or frequency domain.

When m1=0, m2=0,1,2,3,4,5, there is m=m1+m2={0,1,2,3,4,5}, where m1=0 indicates that sharing of the third A COT, m2 indicates offset information in the time domain and/or frequency domain.

When m1=6, m2=0,1,2,3,4,5, m=m1+m2={6,7,8,9,10,11}, m1=6 indicates that sharing the first COT.

For example, the time-frequency domain offset value corresponding to m2 can be as shown in Table 6, Table 7 or Table 8. For example, m2=5 means that the resources shared by UE2 in the first COT are shifted backward by 2 time slots in the time domain and shifted downward by 1 in the frequency domain relative to the reserved resources of UE2 in the first COT. A staggered.

Table 6

Table 7

Table 8

Optionally, the time domain and/or frequency domain offset information represented by m2 is pre-configured or configured by the network. Among them, Table 9 to Table 11 show the offset information corresponding to different frequency domain offset values. Table 12 to Table 15 show the offset information corresponding to different time domain offset values. Among them, the frequency domain offset in Table 9 has both an upward offset and a downward offset, the frequency domain offset in Table 10 has only a downward offset, and the frequency domain offset in Table 11 has only an upward offset. In Table 12, the time domain offset has both left and right offsets, in Table 13, the frequency domain offset only shifts to the left, and in Table 14, the frequency domain offset only shifts to the right. For example, m2 is shown in Table 6, and the time domain offset information in m2 can be determined by looking up Table 9. The frequency domain offset information in m2 can be determined by looking up Table 12. Among them, the upward shift in the frequency domain points to a direction shift with a large interleaving index or sub-channel index. Among them, the downward shift in the frequency domain points to a small directional shift of the interleaving index or sub-channel index. Among them, the time domain shift to the left points to the direction shift with a smaller time slot index. Among them, the time domain shift to the right points to the direction shift with a large time slot index.

Table 9

Table 10

Table 11

Table 12

Table 13

Table 14

In this way, in this implementation, UE1 can determine the cyclic shift m associated with the PSFCH based on whether UE2 is allowed to share and the time-frequency offset information of UE2. Correspondingly, when UE2 receives the PSFCH on the first resource, it can also determine m1 and m2 based on the cyclic shift m associated with the PSFCH, and determine whether UE2 is allowed to share the first COT based on m1. If allowed, determine whether UE2 is in the first COT based on m2. The resources shared within the COT are: the resources that fall within the first COT after the reserved resources of UE2 are offset in the time domain and/or frequency domain according to m2.

Example 2:

m1=0 or 6 respectively indicates that sharing of the first COT is allowed and whether there is an offset in the time domain and/or frequency domain.

m2=0,1,2,3,4,5 respectively indicate offset information in the time domain and/or frequency domain.

When m1=0, m2=0,1,2,3,4,5, m=m1+m2={0,1,2,3,4,5}, m1 indicates that sharing is allowed and no offset is allowed.

When m1=6, m2=0,1,2,3,4,5, there is m=m1+m2={6,7,8,9,10,11}, m1 indicates that sharing is allowed, and m2 indicates the time domain and/or offset information in the frequency domain.

Implementation method two:

UE1 determines the cyclic shift m associated with the PSFCH. The cyclic shift m indicates whether UE2 is allowed to share the first COT. When m indicates that the first COT is allowed to be shared, the cyclic shift m is equal to the first cyclic shift m1 and the second cyclic shift. The sum of m2, where the first cyclic shift m1 indicates the time interval between the time slot of the first reserved resource of UE2 and the reference time slot, and the second cyclic shift m2 indicates the offset in the time domain and/or frequency domain. transfer information.

Optionally, m1=i×Δ, i indicates the number of time slots between the time slot of the first reserved resource of UE2 and the reference time slot, i={0,1}, Δ is an integer, which can be Constant, preconfigured, or network-configured value. For example, Δ=6.

Optionally, m2=j×Δ, j indicates the offset information in the time domain and/or frequency domain, j={0,1,2,3,4,5}, Δ is an integer, which can be a constant, a preset Configuration or network configuration value. For example, Δ=1.

It should be understood that in this implementation, UE1 determines the first cyclic shift m1 according to the time interval between the time slot of the first reserved resource of UE2 and the reference time slot, that is, the first cyclic shift m1 can be used to indicate that the PSFCH is Sent to UE2, correspondingly, UE2 can determine that the PSFCH is sent to itself based on m1 and the reference time slot. For details, please refer to the description in Method 4 above, which will not be described again here.

For example, the cyclic shift m (0 to 11) associated with PSFCH can be divided into three groups, as follows:

When m1=0, m2=0,1,2,3, there is m=m1+m2={0,1,2,3}, m indicates that the first COT is allowed to be shared, and m1=0 indicates that the first preset of UE2 is allowed to be shared. The number of time slots between the time slot where the reserved resource is located and the reference time slot is A (A is an integer, for example, A=1), and m2 indicates offset information in the time domain and/or frequency domain.

When m1=4, m2=0,1,2,3, m=m1+m2={4,5,6,7,8}, m indicates that the first COT is allowed to be shared, and m1=4 indicates that the first COT of UE2 is allowed to be shared. The number of time slots between the time slot where a reserved resource is located and the reference time slot is B (B is an integer, for example, B=2), and m2 indicates offset information in the time domain and/or frequency domain.

When m={10,11}, it indicates that sharing of the first COT is not allowed or there is no sharing relationship.

For example, the time-frequency domain offset information corresponding to m2 may be as shown in Table 15, Table 16, or Table 17.

Table 15

Table 16

Table 17

In this way, after UE2 receives the PSFCH on the first resource, it determines m1 and m2 based on the cycle value m associated with the PSFCH, thereby determining whether UE2 is allowed to share the first COT. If allowed, it determines the resources shared by UE2 in the first COT based on m2. It is: the resources that fall within the first COT after the reserved resources of UE2 are offset in the time domain and/or frequency domain according to m2.

Implementation method three:

UE1 determines the cyclic shift m associated with the PSFCH, which is equal to the sum of the first cyclic shift m1 and the second cyclic shift m2, where the first cyclic shift m1 indicates the time of the first reserved resource of UE2 The number of time slots between the slot and the reference time slot, and the cyclic shift m2 indicates whether UE2 is allowed to share the first COT and offset information in the time domain and/or frequency domain.

Optionally, m1=i×Δ, i indicates the number of time slots separated between the time slot indicating the first reserved resource of UE2 and the reference time slot, i={0,1}, Δ is an integer, and can Is a constant, preconfigured, or network configured value. For example, Δ=6.

Optionally, m2=j×Δ, j indicates whether UE2 is allowed to share the first COT and offset information in the time domain and/or frequency domain, i={0,1,2,3,4,5},Δ It is an integer, which can be a constant, a preconfigured value, or a network configuration value. For example, Δ=1.

For example, the cyclic shift m (0 to 11) associated with PSFCH can be divided into three groups, as follows:

When m1=0, m2=0,1,2,3,4,5, m=m1+m2={0,1,2,3,4,5}, m1=0 indicates the first preset of UE2 The number of time slots between the time slot where the reserved resource is located and the reference time slot is A (A is an integer, for example, A=1). m2 indicates whether UE2 is allowed to share the first COT and the time domain and/or frequency domain. offset information.

When m1=6, m2=0,1,2,3,4,5, m=m1+m2={4,5,6,7,8}, m1=6 indicates the first reserved resource of UE2 The number of time slots between the current time slot and the reference time slot is B (B is an integer, for example, B=2). m2 indicates whether UE2 is allowed to share the first COT and the offset in the time domain and/or frequency domain. transfer information.

For example, the time-frequency domain offset information corresponding to m2 may be as shown in Table 18, Table 19, or Table 20.

Table 18

Table 19

Table 20

In this way, after receiving the PSFCH on the first resource, UE2 determines m1 and m2 based on the cycle value m associated with the PSFCH, and determines whether the first COT shared information is associated with the time domain resource of the first reserved resource based on the value of m1, that is, determines the COT Whether the shared information is sent to yourself. If it is sent to itself, it determines whether UE2 is allowed to share the first COT based on m2. If allowed, the resources shared by UE2 in the first COT are: resources that fall within the first COT after the reserved resources of UE2 are offset in the time domain and/or frequency domain according to m2.

Implementation method four:

UE1 determines the cyclic shift associated with each RB in the interlace where the first COT shared information is located. In this implementation, UE1 uses the difference between the cyclic shift m associated with the i-th RB in the interlace where the first COT shared information is located and the cyclic shift associated with any two adjacent RBs (for example, two adjacent RBs). n (for example, if the difference is a negative number, the absolute value is taken) to indicate relevant information to UE2. i is an integer, for example, i=0, and n is an integer. The difference n between the cyclic shifts of any two adjacent RBs in the interlace where the first COT shared information is located is the same. Optionally, the i-th RB may be any RB in the interlace where the first COT shared information is located. For example, the difference n between the cyclic shifts associated with any two RBs is the difference n between the cyclic shifts of the i-th RB and the i+1-th RB in the interlace where the first COT shared information is located.

It should be understood that two adjacent RBs in an interlace are adjacent within the same interlace, and may not actually be adjacent.

Specifically, the cyclic shift m associated with the i-th RB is determined by the first cyclic shift m1, the second cyclic shift m2, and the third cyclic shift m3.

In a possible method, the first cyclic shift m1 indicates whether the second terminal device is allowed to share the first COT; the second cyclic shift m2 indicates the time between the first reserved resource of UE2 and the reference time slot. Interval; the difference n between the third cyclic shifts m3 of any two adjacent RBs in the interlace where the first COT shared information is located indicates the time domain and/or frequency domain offset information.

It can be understood that "the difference n between the third cyclic shifts m3 of two adjacent RBs" and "the difference n between the cyclic shifts m of two adjacent RBs" are the same and can be replaced synonymously.

In another possible method, the first cyclic shift m1 indicates whether the second terminal device is allowed to share the first COT; the second cyclic shift m2 indicates the distance between the first reserved resource of UE2 and the reference time slot. Time interval; the difference n between the cyclic shifts m of any two adjacent RBs in the interlace where the first COT shared information is located indicates the time domain and/or frequency domain offset information.

In yet another possible method, the first cyclic shift m1 indicates whether the second terminal device is allowed to share the first COT, the second cyclic shift m2 indicates time domain and/or frequency domain offset information, and the first COT The difference n between the third cyclic shifts m3 of any two adjacent RBs in the interlace where the shared information is located indicates the time interval between the first reserved resource and the reference time slot.

In yet another possible method, the first cyclic shift m1 indicates whether the second terminal device is allowed to share the first COT, the second cyclic shift m2 indicates time domain and/or frequency domain offset information, and the first COT The difference n between the cyclic shifts m of any two adjacent RBs in the interlace where the shared information is located indicates the time interval between the first reserved resource and the reference time slot.

For example, UE1 indicates the relevant information to UE2 through the difference n between the cyclic shift m associated with the first RB in the interlace where the first COT shared information is located and the cyclic shift associated with any two RBs n. It can also be understood that UE1 indicates the relevant information to UE2 through the cyclic shift m associated with at least 2 RBs in the interlace where the first COT shared information is located.

Example 1:

The first cyclic shift m1 indicates whether UE2 is allowed to share the first COT; the second cyclic shift m2 indicates the time interval between the first reserved resource of UE2 and the reference time slot; the interleave in which the first COT sharing information is located The difference n between the third cyclic shifts m3 of any two adjacent RBs indicates time domain and/or frequency domain offset information.

Optionally, m1=i×Δ, i indicates whether the second terminal device is allowed to share the first COT, i={0,1}, and Δ is an integer, which can be a constant, a preconfigured value, or a network configuration value. For example, Δ=6.

Optionally, m2=j×Δ, j indicates the time interval between the first reserved resource of UE2 and the reference time slot, j={0,1,2,3,4,5}, Δ is an integer, and can Is a constant, preconfigured, or network configured value. For example, Δ=1.

Optionally, m3,k indicates the offset information in the time domain and/or frequency domain, or, k={0,1,2,3,4,5}, Δ is an integer, which can be a constant, preconfigured or Network configuration value. For example, Δ=3.

Optionally, n=k×Δ, k indicates offset information in the time domain and/or frequency domain, k={0,1,2,3,4,5}, Δ is an integer, which can be a constant, a preset Configuration or network configuration value. For example, Δ=3.

For example, UE1 determines that the interlace where the first COT shared information is located contains multiple RBs, and the cyclic shifts associated with the multiple RBs are {2, 5, 8, 11, 2, 5, 8, 11...} respectively. Among them, the cyclic shift associated with the first RB in the interlace where the first COT shared information is located is 2, the cyclic shift associated with the second RB in the interlace where the first COT shared information is located is 5, and so on, the first The cyclic shift m3 associated with two adjacent RBs in the interleave where the COT shared information is located is 3, which will not be described again here. The information indicated by m can be described as follows:

For the cyclic shift m _i associated with the i-th RB:

When m1 _i =0, m2 _i =0,1,2,3,4,5, m3 _i =0, there is m _i =m1 _i +m2 _i +m3 _i ={0,1,2,3,4 ,5}, where m1 _i =0 indicates that the first COT is allowed to be shared, and m2 _i indicates the interval between the first reserved resource of UE2 and the reference time slot. When m1 _i =6, m2 _i =0,1,2,3,4,5, m3 _i =0, there is m _i =m1 _i +m2 _i +m3 _i ={6,7,8,9,10 ,11}, m1 _i =6 indicates that sharing the first COT is not allowed, and m2 _i indicates the interval between the first reserved resource of UE2 and the reference time slot.

For example, the cyclic shift m _i =2 associated with the i-th RB, where m1 _i =0, m2 _i =2, m3 _i =0, m1 _i =0 indicates that the first COT is allowed to be shared, and m2 _i =2 indicates that UE2 The interval between the first reserved resource and the reference time slot is 2, and m3 _i =0 is used to calculate the difference n between the two RBs with m3 of the adjacent RB.

For the cyclic shift m _i+1 associated with the i+1th RB: when m1 _i+1 =0, m2 _i+1 =0,1,2,3,4,5, m3 _{i +1} =3, There is m _i+1 =m1 _i+1 +m2 _i+1 +m3 _i+1 ={0,1,2,3,4,5}, where m1 _i+1 =0 indicates that the first COT is allowed to be shared, m2 _i+1 indicates the interval between the first reserved resource of UE2 and the reference time slot. When m1 _i+1 = 6, m2 _i+1 = 0, 1, 2, 3, 4, 5, m3 _i+1 = 3, there is m = m1 _i+1 +m2 _i+1 +m3 _i+1 ={6,7,8,9,10,11}, m1=6 indicates that sharing the first COT is not allowed, m2 _i+1 indicates the interval between the first reserved resource of UE2 and the reference time slot.

For example, the cyclic shift m _i+1 associated with the i+1th RB is 5, where m1 _i+1 =0, m2 _i+1 =2, and m3 _i+1 =3. m1 _i+1 =0 indicates that the first COT is allowed to be shared, m2 =2 indicates that the interval between the first reserved resource of UE2 and the reference time slot is 2, m3 _i+1 =3 is used for m3 with adjacent RBs Calculate the difference n between two RBs.

Then, the difference between the third cyclic shifts of the i-th RB and the i+1-th RB in the interleave where the first COT shared information is located is n=mi ₊₁ - _mi =3 or n=m3 _i+1- m3 _i =3, n=3 represents time domain and/or frequency domain offset information.

For example, whether sharing of the first COT corresponding to m1 is allowed is as shown in Table 21.

Table 21

For example, the interval between the first reserved resource corresponding to m2 and the reference time slot may be as shown in Table 22.

Table 22

For example, the time-frequency domain offset value corresponding to n can be as shown in Table 23, Table 24, or Table 25.

Table 23

Table 24

Table 25

Then, after receiving the PSFCH on the first resource, UE2 determines m1, m2, and m3 according to the cycle value m associated with the PSFCH. Determine whether the COT shared information is associated with the time domain resource of the first reserved resource according to the value of m2, that is, determine whether the COT shared information is sent to itself. If it is sent to itself, it is determined based on m1 that UE2 is allowed to share the first COT. The interleave where the first COT shared information is located is then determined based on the difference 3 between the cyclic shifts associated with any two RBs. The resources shared by UE2 in the first COT are backward in the time domain relative to the reserved resources of UE2 in the first COT. Offset by 1 time slot and 1 interleave down in the frequency domain.

Example 2:

The first cyclic shift m1 indicates whether the second terminal device is allowed to share the first COT, the second cyclic shift m2 indicates the time domain and/or frequency domain offset information, and any adjacent interleave where the first COT shared information is located The difference n between the third cyclic shifts m3 of the two RBs indicates the time interval between the first reserved resource and the reference slot.

Optionally, m1=i×Δ, i indicates whether the second terminal device is allowed to share the first COT, i={0,1}, and Δ is an integer, which can be a constant, a preconfigured value, or a network configuration value. For example, Δ=6.

Optionally, m2=j×Δ, j indicates time domain and/or frequency domain offset information, j={0,1,2,3,4,5}, Δ is an integer, which can be a constant, preconfigured or Network configuration value. For example, Δ=1.

Optionally, m3=k×Δ, k indicates the time interval between the first reserved resource and the reference time slot, or k={0,1,2,3,4,5}, Δ is an integer, and can Is a constant, preconfigured, or network configured value. For example, Δ=3.

Optionally, n=k×Δ, k indicates the time interval between the first reserved resource and the reference time slot, k={0,1,2,3,4,5}, Δ is an integer and can be a constant , preconfigured or network configured values. For example, Δ=3. For example, UE1 determines that the interlace where the first COT shared information is located contains multiple BRs, and the cyclic shifts associated with the multiple RBs are {2, 5, 8, 11, 2, 5, 8, 11...} respectively. Among them, the cyclic shift m associated with the first RB in the interlace where the first COT shared information is located is 2, and the cyclic shift m associated with the second RB in the interlace where the first COT shared information is located is 5, and so on. The cyclic shift m3 associated with two adjacent RBs in the interleave where one COT shared information is located is 3, which will not be described again here. The information indicated by m can be described as follows:

For the cyclic shift m _i associated with the i-th RB:

When m1 _i =0, m2 _i =0,1,2,3,4,5, m3 _i =0, there is m=m1+m2+m3={0,1,2,3,4,5}, Among them, m _i =m1 _i +m2 _i +m3 _i ={0,1,2,3,4,5}, where m1 _i =0 indicates that the first COT is allowed to be shared, m2 _i indicates the time domain and/or Frequency domain offset information.

When m1 _i =6, m2 _i =0,1,2,3,4,5, m3 _i =0, there is m _i =m1 _i +m2 _i +m3 _i ={6,7,8,9,10 ,11}, m1 _i =6 indicates that sharing of the first COT is not allowed, and m2 _i indicates time domain and/or frequency domain offset information.

For example, the cyclic shift associated with the i-th RB is m _i =2, where m1 _i =0, m2 _i =2, and m3 _i =0. m1 _i+1 =0 indicates that the first COT is allowed to be shared, m2 _i+1 indicates the time domain and/or frequency domain offset information of UE2, m3 _i =0 is used to calculate the difference between two RBs with m3 of the adjacent RB n.

For the cyclic shift m _i+1 associated with the i+1th RB:

When m1 _i+1 = 0, m2 _i+1 = 0, 1, 2, 3, 4, 5, m3 _i+1 = 3, there is m _i+1 = m1 _i+1 +m2 _i+1 +m3 _i+1 ={0,1,2,3,4,5}, where m1 _i+1 =0 indicates that the first COT is allowed to be shared, and m2 _i+1 indicates the difference between the first reserved resource of UE2 and the reference time slot. interval between.

When m1 _i+1 = 6, m2 _i+1 = 0, 1, 2, 3, 4, 5, m3 _i+1 = 3, there is m _i+1 = m1 _i+1 +m2 _i+1 +m3 _i+1 = {6, 7, 8, 9, 10, 11}, m1 _i+1 = 6 indicates that the first COT is not allowed to be shared, and m2 indicates the time domain and/or frequency domain offset information of UE2.

For example, the cyclic shift m _i+1 associated with the i+1th RB is 5, where m1 _i+1 =0, m2 _i+1 =2, and m3 _i+1 =3. m1 _i+1 =0 indicates that the first COT is allowed to be shared, m2 _i+1 =2 indicates the indicated time domain and/or frequency domain offset information of UE2, m3 _i+1 =3 is used for m3 calculation with adjacent RBs The difference between two RBs is n.

The difference between the cyclic shifts of the i-th RB and the i+1-th RB in the interleave where the first COT shared information is located n=mi ₊₁ - _mi =3 or n=m3 _i+1- m3 _i =3 , indicating that the interval between the first reserved resource of UE2 and the reference time slot is 3.

For example, whether m1 is allowed to share the first COT can be shown in Table 26.

Table 26

For example, the time-frequency domain offset value corresponding to m2 can be as shown in Table 27, Table 28, or Table 29.

Table 27

Table 28

Table 29

For example, the interval between the first reserved resource corresponding to n and the reference time slot may be as shown in Table 30.

Table 30

Then, after receiving the PSFCH on the first resource, UE2 determines m1, m2, and m3 according to the cycle value m associated with the PSFCH. Determine whether the COT shared information is associated with the time domain resource of the first reserved resource based on the difference in cyclic shifts associated with any two RBs, that is, determine whether the COT shared information is sent to itself. If it is sent to itself, it is determined based on m1 that UE2 is allowed to share the first COT. Then, based on m2=2, it is determined that the resources shared by UE2 in the first COT are shifted backward by one time slot in the time domain relative to the reserved resources of UE2 in the first COT, but are not shifted in the frequency domain.

Implementation method four:

UE1 determines the cyclic shift associated with each RB in the interlace where the first COT shared information is located. In this implementation, UE1 uses the cyclic shift m associated with the i-th RB in the interlace where the first COT shared information is located and any two The difference n between the cyclic shifts associated with the RB (the difference is a negative number and is an absolute value) indicates relevant information to UE2. The difference in cyclic shifts of any two adjacent RBs in the interlace where the first COT shared information is located is the same. Optionally, the i-th RB may be any RB in the interlace where the first COT shared information is located.

Optionally, the cyclic shift m associated with the i-th RB is determined by a first cyclic shift m1 and a second cyclic shift m2, where the first cyclic shift m1 indicates whether the second terminal device is allowed to share the first COT, the second cyclic shift m2 indicates the time interval between the first reserved resource of UE2 and the reference time slot, and the third cyclic shift n is the cycle of any two adjacent RBs in the interleave where the first COT shared information is located. The difference of the shifts, the third cyclic shift n indicates time domain and/or frequency domain offset information.

Optionally, m1=i×Δ, i indicates whether the second terminal device is allowed to share the first COT, i={0,1}, and Δ is an integer, which can be a constant, a preconfigured value, or a network configuration value. For example, Δ=6.

Optionally, m2=j×Δ, j indicates the time interval between the first reserved resource and the reference time slot, j={0,1,2,3,4,5}, Δ is an integer and can be a constant , preconfigured or network configured values. For example, Δ=1.

Optionally, n=k×Δ, k indicates time domain and/or frequency domain offset information, or k={0,1,2,3,4,5}, Δ is an integer, which can be a constant, Configuration or network configuration value. For example, Δ=3.

Optionally, the cyclic shift m associated with the i-th RB is determined by a first cyclic shift m1 and a second cyclic shift m2, and the first cyclic shift m1 indicates whether the second terminal device is allowed to share the first COT, The second cyclic shift m2 indicates the difference between the cyclic shifts of any two adjacent RBs in the interlace where the first COT shared information of the time domain and/or frequency domain offset information is located, and the third cyclic shift n is the third cyclic shift of UE2 The time interval between a reserved resource and a reference time slot.

Optionally, m1=i×Δ, i indicates whether the second terminal device is allowed to share the first COT, i={0,1}, and Δ is an integer, which can be a constant, a preconfigured value, or a network configuration value. For example, Δ=6.

Optionally, m2=j×Δ, j indicates time domain and/or frequency domain offset information, j={0,1,2,3,4,5}, Δ is an integer, which can be a constant, preconfigured or Network configuration value. For example, Δ=1.

Optionally, n=k×Δ, k indicates the time interval between the first reserved resource and the reference time slot, or k={0,1,2,3,4,5}, Δ is an integer, and can Is a constant, preconfigured, or network configured value. For example, Δ=3.

For example, UE1 indicates the relevant information to UE2 through the difference n between the cyclic shift m associated with the first RB in the interlace where the first COT shared information is located and the cyclic shift associated with any two RBs n. UE1 determines that the cyclic shift associated with the RB in the interlace where the first COT shared information is located is {2, 5, 8, 11,...,}, where the cyclic shift associated with the first RB in the interlace where the first COT shared information is located Bit m is 2, and the cyclic shift associated with the second RB in the interleave where the first COT shared information is located is 5. By analogy, the cyclic shift associated with two adjacent RBs in the interlace where the first COT shared information is located is n It is 3, so I won’t go into details here. The information indicated by m and n can be described as follows:

When m1=0, m2=0,1,2,3,4,5, there is m=m1+m2={0,1,2,3,4,5}, where m1 indicates that the first COT is allowed to be shared , m2 indicates the interval between the first reserved resource of UE2 and the reference time slot, n indicates the offset information in the time domain and/or frequency domain.

When m1=6, m2=0,1,2,3,4,5, m=m1+m2={6,7,8,9,10,11}, m1 indicates that sharing the first COT is not allowed.

As an example, the time-frequency domain offset value corresponding to n can be shown in Table 31.

Table 31

How UE2 parses the PSFCH after receiving it will not be described again here.

In the above technical solution, when the reserved resources of UE2 and UE3 overlap in the first COT, UE1 indicates the time domain or frequency domain offset information to ensure that the resources actually shared by UE2 and UE3 in the first COT do not overlap. Thus, UE2 and UE3 can share the first COT of UE1 at the same time. From the perspective of a single UE, the reliability of UE2 and UE3 is ensured; both UE2 and UE3 can access the channel as soon as possible, preventing the UE from re-executing the LBT process, reducing the UE information transmission delay, and improving spectrum utilization from a system perspective.

The above describes the indication method when the first COT shared information is carried on the PSFCH. The following example illustrates when the first COT shared information is carried on other signaling, such as first-order SCI, second-order SCI, a new second-order SCI (such as SCI 2-D), MAC CE, PC-5 RRC, and RRC signaling, how does UE1 indicate the first COT shared information to UE2.

Optionally, the first COT sharing information includes N pieces of indication information, each of the N pieces of indication information includes identification information of the terminal device and resource information of the terminal device sharing the first COT, and N is a positive integer. Several specific implementation methods are given below.

Implementation method one:

The identification information of the terminal device includes M terminal device identifiers. The resource information of the terminal device sharing the first COT indicates the first time slot. The first time slot is the time shared by the terminal devices corresponding to the M terminal device identifiers in the first COT. unit, the channel corresponding to the first COT includes L interleaves or sub-channels, and each indication information indicates that the terminal device corresponding to the i-th terminal device identifier among the M terminal device identifiers shares the i-th interleave of L interleaves or sub-channels Or sub-channel, where M, L and i are all positive integers, and M is less than or equal to L.

For example, the first COT shared information includes an indication information of {first time slot, UE identification information 1, UE identification information 2, UE identification information 3,...}.

Optionally, the resource information of the terminal device sharing the first COT indicates the first time slot. Specifically, it may indicate the time slot interval of the first time slot relative to the reference time slot, or indicate the time slot number of the first time slot. Optionally, the reference time slot may be the first time slot of the first COT, the first valid time slot of the first COT, the time slot in which the first COT shared information is sent, or the time slot indicated by the DFN index and/or the time slot index. any one of the gaps. Optionally, the slot number of the slot is indicated by a DFN index and/or a slot index. Optionally, the time slot interval is an integer number of time slots, such as {0,1,2,3,4,5,6,7,8,9,10} time slots.

Optionally, the identification information of the UE may be the identification information of the UE of the first COT, such as the identification information of UE1; or it may be the identification information of the UE sharing the first COT, such as the identification information of UE2. Optionally, the identification information of the UE may be So: at least any one of the source identification information of UE1 or UE2, the destination identification information of UE1 or UE2, the device identification information of UE1 or UE2, and the group identification information of UE1 or UE2. Optionally, the identification information of the UE is carried in the first-order and/or second-order SCI.

Optionally, the identification information of the UE includes Q bits, and the value of Q is a predefined, preconfigured or network-configured integer.

Optionally, a value can also be predefined in this implementation. This predefined value indicates that the COT is not shared or indicates that it is used for transmission by UEl. The predefined value contains Q bits, and the values of Q bits are all 0 or all 1; or, the predefined value is P bits (P is less than or equal to Q), and the value of P is all 0 or all 1. is 1.

The following example illustrates implementation method 1.

Example 1:

The first COT shared information includes time slot information "3" and UE identification information "SID2, SID2, SID3, X", that is, the first COT shared information is {3, SID2, SID2, SID3, X}, where 3 represents The shared time slot is the third time slot after the first time slot in the first COT; SID2 is the source identification information of UE2, and SID3 is the source identification information of UE3. Specifically, the frequency domain resources in the first COT include 4 interlaces. Then, UE1 indicates through {3, SID2, SID2, SID3, X} that the 4th time slot in the first COT is used to share with UE2 and UE3 for transmission. , enable UE2 to share the first COT on the interlace with index 0 and 1, enable UE3 to share the first COT on the interlace with index 2; X is a predefined value, for example, X is all 0 of the Q bit, or X is P, and X means that it is not shared in interleaved 4.

Example 2:

UE1 uses {6,SID1,SID1,SID1,SID1} or {6,Y} to indicate the 6th time slot in the first COT for its own transmission; or, to indicate the 6th time slot in the first COT The channel is used for its own transmission; or, it is used to indicate that the 6th time slot in the first COT is not used for COT sharing; or, it is used to indicate that the channel of the 6th time slot in the first COT is not used for COT sharing. Y is a predefined value, for example, Y is all 1s of Q bits.

Implementation method two:

The first COT shared information includes the identification information and resource indication information of the UE. The resource indication information may be information about the UE's transmission time-frequency resources in the first COT corresponding to the UE's identification information (that is, transmission resources shared within the first COT), or whether the UE is enabled to share the first COT's information. For a description of the identification information of the UE, please refer to the description in Embodiment Mode 2, which will not be described again here.

Optionally, the first COT shared information includes R combinations, and each combination includes identification information of a UE and resource indication information.

Optionally, UE1 indicates the time domain resources and frequency domain resources transmitted by the UE in the first COT through {identification information of the UE, information on the time domain resources, and information on the frequency domain resources}. Optionally, the information of time domain resources is indicated by TRIV. Optionally, the frequency domain resource information is indicated by FRIV. Optionally, the frequency domain resources are frequency domain resources in an interleaved manner or frequency domain resources in a channel form. For example, UE1 indicates the time domain resources and frequency domain resources transmitted by UE2 in the first COT through {SID2, TRIV, FRIV}.

Optionally, UE1 instructs the UE to transmit according to the time-frequency location of the UE's reserved resources within the first COT through {identification information of the UE, enable}. For example, UE1 uses {SID2, enable} to instruct UE2 to transmit in the first COT according to the time-frequency location indicated by the reservation information of UE2.

Optionally, UE1 indicates the resources that the UE transmits in the first COT through {identification information of the UE, bitmap}. For example, UE1 indicates the resources transmitted by UE2 in the first COT through {SID2, bitmap}.

In the above technical solution, since the number of bits carrying the first COT shared information is more than that of the PSFCH, the shared information can be directly and more accurately indicated.

Similar to the PSFCH indicating offset information, in this embodiment, UE1 may also indicate time domain and/or frequency domain offset information in the first COT shared information.

In a specific implementation manner, the first COT sharing information includes time-frequency offset information, and the time-frequency offset information indicates that UE2 shares the first transmission according to the reserved resources and time-frequency offset information of UE2 in the first COT. resource. Correspondingly, UE2 may determine the first transmission resource according to its own reservation information and the time domain and/or frequency domain offset information indicated by UE1. The first transmission resources are resources that fall within the first COT after the reserved resources of UE2 are offset in the time domain and/or frequency domain according to the time-frequency offset information. UE2 shares the first transmission resources.

Optionally, the time-frequency offset information includes a time-frequency offset direction and a time-frequency offset value. For example, 2 bits are used to indicate the time-frequency offset direction, for example: 00 indicates an upward offset in the frequency domain, 01 indicates a downward offset in the frequency domain, 10 indicates a left offset in the time domain, and 11 indicates a right offset in the time domain. For example, N bit is used to indicate the number of interleaves shifted downward or upward in the frequency domain. For example, when there are U interleaves in the channel, then For example, M bit is used to indicate the number of time slots shifted to the left or right in the time domain. For example, there are V time slots in the first COT, and V is an integer less than 40.

Optionally, the time-frequency offset information includes a time-domain offset direction and a time-domain offset value, or the time-frequency offset information includes a frequency-domain offset direction and a frequency-domain offset value. For example, the time-frequency offset information includes a frequency domain offset direction and a frequency domain offset value. UE1 can use 1 bit to indicate the frequency domain offset direction, for example: 0 indicates an upward offset and 1 indicates a downward offset. For example, N bit is used to indicate the number of interleaves shifted downward or upward. For example, when there are U interleaves in the channel, then

In the above technical solution, when the reserved resources of UE2 and UE3 overlap within the first COT, UE1 enables both UE2 and UE3 to transmit within the first COT of UE1 by indicating the time domain or frequency domain offset information. From the perspective of a single UE, the reliability of UE2 and UE3 is ensured; both UE2 and UE3 can access the channel as soon as possible, avoiding the need to re-execute the LBT process and reducing latency. Spectrum utilization is also improved from a system perspective.

Optionally, the first-order control information includes a first field, the first field indicates whether the resource where the first-order control information is located carries the first COT shared information; or, whether the first field exists indicates that the first-order control information exists Whether the resource where it is located carries the first COT shared information. Whether the resource where the first-order control information is located carries the first COT shared information includes whether the second-order SCI, MAC CE or PSFCH in the resource where the first-order control information is located carries the first COT shared information.

Optionally, when the first COT shared signaling is carried in the second-order SCI and MAC CE, UE1 uses the first field to instruct UE2 to decode the second-order SCI (for example, second-order SCI-D) and MAC CE bearer in the first-order SCI. The first COT shared information or the first COT shared information carried by PSFCH. It should be understood that the first-order SCI is the first-order SCI carried by the resource where the first COT shared information is located; or, the PSSCH scheduled by the first-order SCI carries the first COT shared information.

For example, the first field occupies 1 bit. A 0 in the first field indicates that the second-order SCI, MAC CE or PSFCH does not carry the first COT shared information; a 1 in the first field indicates that the second-order SCI, MAC CE or PSFCH carries the first COT share. information. For another example, the presence of the first field indicates that the second-level SCI or MAC CE carries the first COT shared information; the absence of the first field indicates that the second-level SCI or MAC CE does not carry the first COT shared information.

It can be understood that the main reason for using the first field indication in SCI-1 is to let the receiving UE know whether the second-order SCI, MAC CE or PSFCH carried on the resource where the control information is located carries the first COT shared information when detecting the control information. . If it is carried, decoding will continue, even if the resource does not carry the data sent to itself; if it is not carried, the data sent to itself is not carried on the resource, and there is no need to continue decoding.

Optionally, when the second-order SCI carries the first COT shared information, the second-order SCI includes a second field and a third field. The second field indicates the number of time slots available for sharing within the first COT. The third field is used to indicate the UE information on the number of shared time slots. For example, the third field is {time slot information, UE identification information 1, UE identification information 2, UE identification information 3,...}.

Optionally, when the second-order SCI carries the first COT shared information, the second-order SCI includes a fourth field and a fifth field. The fourth field indicates the number of UEs sharing transmission within the first COT. The fifth field indicates the transmission information of the UE. For example, the fifth field is {identification information of UE, information of time domain resources, information of frequency domain resources}, or {identification information of UE, enable}.

Optionally, when the MAC CE carries the first COT shared information, the MAC CE can transmit the first COT shared information through multicast or broadcast. Optionally, all UEs sharing the first COT can decode MAC CE; or, UEs in the same group as UE1 can decode MAC CE; or, UEs in the resource pool can decode MAC CE.

Optionally, the RNTI of the MAC CE indicates that the MAC CE carries the first COT shared information.

The above describes in detail how the first COT shared information is carried in different signaling and indicated to UE2. The conditions that need to be met for sending the first COT shared information time domain resource (that is, the time domain resource of the first resource) to UE2 are described in detail below.

(1) The time interval between the starting time domain position of the first COT and the time domain position of the first resource is greater than or equal to the first duration.

(2) The time interval between UE2 sending the resource of the first SCI and sending the first COT shared information is greater than the second time length.

(3) The interval between the time domain position of the first resource and the actual reserved resource position of UE2 is greater than the third duration. The third duration is the time for UE2 to decode the first COT shared information, package packets, and transmit and receive conversion. Otherwise, UE2 itself Initial COT.

(4) The time interval between the time domain location of the first resource and the actual reserved resource location of UE2 is greater than the fourth time length.

(5) The time interval between the time domain position of the first resource and the time domain position transmitted by UE2 in the first COT is greater than or equal to the fifth time length.

Optionally, the time domain position of the first resource in the above condition is the starting position of the time slot where the first resource is located, the end position of the time slot where the first resource is located, the starting position of the symbol where the first resource is located, the starting position of the symbol where the first resource is located, Any of the ending position of the symbol, the ending position of the last symbol of the first resource, or the starting position of the first symbol of the first resource. Optionally, the time domain location of the first resource is pre-configured or configured by the network to be any one of the above locations.

Optionally, the Sth duration is related to subcarrier spacing (SCS), where the Sth duration is any one of the first duration, the second duration, the third duration, the fourth duration, and the fifth duration. The length of the S-th time slot under different SCS is as shown in Table 32 or Table 33 or Table 34 or Table 35 or Table 36 or Table 37.

Table 32

Table 33

Table 34

Table 35

Table 36

Table 37

Optionally, the Sth duration is any one of 0, 1, 2, 3, 4, 5, 6, 7, and 8 time slots. For example, the value of the Sth duration is configured through preconfiguration or network configuration.

Optionally, the Sth duration includes a sum of times corresponding to A milliseconds + B number of time slots, and A and B are both positive numbers.

Optionally, the Sth duration includes at least one of the following times, or the sum of at least two of them: time to prepare sensing results; time to report sensing results to the MAC layer; MAC layer selection of resources or creation of authorization (selected sidelink grant) The time; the time when the MAC layer indicates resources to the physical layer; the time for transceiver conversion; and the data preparation time. The data preparation time includes the time for at least one of channel coding, modulation, RE mapping, OFDM signal generation, and packetization.

Optionally, if the time domain resource for sending the first COT shared information does not meet at least any one of the above conditions, UE2 does not share the first COT, or UE2 accesses the initial COT through a type 1 channel (for example, type 1 LBT) .

Optionally, the time domain resource carrying the first COT shared information (that is, the time domain resource of the first resource) can be any of the following:

The first COT shared information time domain resource is located on the M symbols after the symbol where the PSCCH is located; or, the first COT shared information time domain resource is located on the nearest M symbols after the symbol where the PSCCH is located; or, the first COT shared information time domain resource is located on the M symbols after the symbol where the PSCCH is located. The domain resources are located on the nearest M symbols separated by the first symbol interval after the symbol where the PSCCH is located, and the first symbol interval is a positive integer; or, the first COT shared information time domain resource is located on the first M symbols of the timeslot, or, The first COT shared information time domain resource is located on the penultimate and penultimate symbols of the time slot. Among them, M is an integer, such as M=1, 2, 3.

S704: UE2 determines whether UE2 is allowed to share the first COT based on the first COT sharing information.

Regarding the steps for UE2 to parse whether the first COT shared information is sent to itself, and the steps for the second terminal to determine whether the first COT can be shared based on the first COT shared information, please refer to the description above for details, and will not be repeated here. . In the above technical solution, UE1 can indicate whether other terminal devices can share the initial COT according to the reserved resources indicated by the SCI of other terminal devices (such as UE2), so that the transmission of UE1 and the transmission of other terminal devices can be formed within the COT. Continuous transmission to avoid UE1 initial COT interruption. In addition, shared UE2 can transmit its own initial COT or share UE1's COT transmission. For the former (UE2's own initial COT transmission), if UE2's reserved resources are within the initial COT of UE1 and UE1 does not share them with UE2 for transmission (such as transmitting by itself or transmitting to other shared UEs), then UE2 will not reserve the resources before LBT is successful. That is to say, UE2 will not be able to transmit until at least UE1's COT transmission is completed. For the latter (UE2 shares the COT of UE1), UE2 can transmit in the time domain of reserved resources to reduce latency.

The following continues to describe how other UEs access the first COT after UE1 allows other UEs to share the first COT. According to the NR-U channel access regulations, when the UE shares the COT of other devices, it must perform type2 LBT before accessing. Similarly, in SL-U, when the UE shares the COT of other devices, it must also perform type2 LBT before accessing. As shown in Figure 15, the first COT of UE1 includes 6 time slots, namely time slot 1 to time slot 6. UE2, UE3, and UE4 are all UEs that share the first COT. In SL-U, if according to access regulations, when UE2, UE3, and UE4 access the first COT of UE1, type2 LBT must be performed before access. The time slots shared by UE2, UE3, and UE4 in the first COT are as shown in the figure. The time slot that UE2 and UE3 need to access the first COT is time slot 3, and the time slot that UE4 needs to access the first COT is time slot. 4. Since the starting time slots of the reserved resources of UE2 (or UE3) and UE4 in the first COT are different (that is, UE2 and UE4 access the channel in different time slots successively), UE2's continuous transmission will cause UE4's LBT to fail. , therefore, this embodiment designs that UE2, UE3, and UE4 reserve time domain resources for type2 LBT at certain time domain locations within the first COT to ensure that UEs newly accessing the first COT can successfully access.

Optionally, the time domain resources for type 2 LBT can be understood as time domain resources in which UE1 and/or the UE sharing the first COT do not send SL information; or, the transmission of UE1 and/or the UE sharing the first COT is The time domain resource of GAP; or the time domain resource of UE1 and/or the UE sharing the first COT to stop sending SL information; or the time domain resource of UE1 and/or the UE sharing the first COT to stop sending SL information.

Optionally, the time length unit for performing type2 LBT is us, ms, symbol, and time slot. For example, the time length for type2 LBT is at least any one of 16us, 23us, 25us, 29us, 30us, 32us, 38us, 39us, 42us, and 51us. For example, the time length for preconfiguration or network configuration to perform type2 LBT is at least any of the above values. One item. When the time domain resource for type2 LBT is a time slot or symbol, the time domain resource for not sending SL information may be less than or equal to the time length corresponding to the symbol.

Optionally, the location of the time domain resource for type2 LBT in a time slot may be located at the following location: M symbols after the starting position of a time slot, or M symbols before the end position of a time slot. , or, on M symbols in a time slot. Among them, M is a positive integer, such as M=1, 2, 3. For example, the time domain resources for type 2 LBT in a time slot are located on the M symbols after the symbol where the PSCCH is located; or, the time domain resources for type 2 LBT in a time slot are located on the nearest M symbols after the symbol where the PSCCH is located. ; Or, the time domain resource for type2 LBT in a time slot is located on the nearest M symbols after the symbol where the PSCCH is located and separated by the first symbol interval, and the first symbol interval is a positive integer number of symbols.

Below, this application provides several specific implementation methods for determining which time slots of the first COT to reserve time domain resources for type 2 LBT.

Implementation method one:

Each time slot in the first time slot set includes time domain resources for type2 LBT, where the first time slot set is the time when each terminal device among all terminal devices sharing the first COT accesses the first COT. A collection of gaps.

Optionally, UE2 continuously transmits N PSCCH and/or PSSCH on N time slots (N is an integer greater than or equal to 1), then the time slot in which UE2 transmits the first PSCCH and/or PSSCH is when UE2 accesses the third time slot. A COT time slot. For example, as shown in Figure 15, the first COT of UE1 includes 6 time slots, namely time slot 1 to time slot 6. UE2, UE3, and UE4 are all UEs sharing the first COT. The time slots shared by UE2, UE3, and UE4 in the first COT are as shown in Figure 15. Then the time slot for UE2 and UE3 to access the first COT is time slot 3. , the time slot in which UE4 accesses the first COT is time slot 4, then the first time slot set includes time slot 3 and time slot 4.

Optionally, UE2 continuously transmits N PSCCH and/or PSSCH on M time slots (N is an integer greater than or equal to 1), then the first PSCCH and/or PSSCH time slot that UE2 continuously transmits is the time slot for UE2 access The time slot of the first COT. For example, as shown in Figure 15, the first time slot set includes time slot 3.

Optionally, UE2 transmits N PSCCH and/or PSSCH non-continuously on M time slots (N is an integer greater than or equal to 1), then the time slot in which UE2 transmits each PSCCH and/or PSSCH is the first time UE2 accesses COT time slot. For example, as shown in Figure 15, the first time slot set includes time slot 3 and time slot 4.

Implementation method two:

Each time slot of the first time slot set includes time domain resources for type2 LBT, where the first time slot set is a set of time slots for each terminal device to transmit SL information among all terminal devices sharing the first COT. .

Optionally, UE2 transmits N PSCCH and/or PSSCH on N time slots (N is an integer greater than or equal to 1), then the time slot in which UE2 transmits each PSCCH and/or PSSCH is the time slot in which UE2 transmits SL information. . For example, as shown in Figure 15, the first time slot set includes time slot 3 and time slot 4.

Implementation method three:

Each time slot in the first time slot set includes time domain resources for type2 LBT, where the first time slot set is the set of all time slots in the first COT. For example, as shown in Figure 15, the first time slot set includes time slot 1, time slot 2, time slot 3, time slot 4, time slot 5, and time slot 6.

Optionally, it can be at least any one of the above three implementation methods of predefinition, preconfiguration, or network configuration.

Optionally, in this application, UE2 determines the resources that UE3 transmits (shares) in the first COT based on the COT sharing information indicated by UE1 to UE3 and the second SCI sent by UE3, where the second SCI indicates the reservation of UE3 resource. In this way, UE2 can determine which times of the first COT according to any of the above three implementation methods. Slots are required for type2 LBT, i.e. determine the first set of slots. For example, when the first COT shared information is carried on the PSFCH, which time slots of the first COT need to be used for type 2 LBT can be determined through implicit indication.

Optionally, UE1 can explicitly indicate whether there are type2 LBT time domain resources on the time slot after the reference time slot. Optionally, the reference time slot may be: a time slot for sending the first COT shared information, a time slot for UEl to access the channel, the first time slot within the first COT of UEl, and the first complete time slot within the first COT of UEl. time slot, the first valid time slot in the first COT of UE1.

Optionally, the explicit indication may use a bitmap to indicate whether there are type2 LBT time domain resources on the time slot after the reference time slot. For example, based on Figure 15, taking the time slot for sending the first COT sharing information as the reference time slot, 1100 indicates that in slots 3 to 6, the UE sharing the first COT can perform type2 LBT in slots 3 and 4. . For another example, taking the first time slot in the first COT of UE1 as the reference time slot, and using 001100 to indicate time slots 1 to 6, the UEs sharing the first COT can perform type2 LBT in time slots 3 and 4.

The above clarifies which time slots in the first COT need to be reserved for type2 LBT time domain resources. The following mainly describes the possible locations of type2 LBT time domain resources in a time slot.

Optionally, the AGC symbols and/or GAP symbols in each time slot in the first time slot set include time domain resources for type2 LBT. For the convenience of description, the time domain resource of type2 LBT is the sixth duration as an example.

Optionally, the sixth duration is at least any one of 16us, 23us, 25us, 29us, 30us, 32us, 38us, 39us, 42us, and 51us. Optionally, the value of the sixth duration is pre-configured or network-configured.

Method 1: The symbol where the AGC is located includes time domain resources for type2 LBT.

Optionally, the AGC symbols include time domain resources for type2 LBT. It can also be understood that the time domain resource used for type2 LBT is located on the first symbol of the time slot. As shown in (a) of Figure 16, the first sixth duration of this symbol is the time domain resource used for type2 LBT. The remainder of the symbol is used for the AGC of this slot. For example, at 15kHz, the length of a symbol is 71.35us, of which the first sixth duration = 25us is the time domain resource used for type2 LBT, and the last 46.35us is the symbol used for AGC.

Method 2: Use cyclic prefix extension (cyclic prefix extension) CPE to replace AGC. The symbol where CPE is located includes time domain resources for type2 LBT.

Optionally, CPE symbols include time domain resources for type2 LBT. It can also be understood that the time domain resource used for type2 LBT is located on the first symbol of the time slot. As shown in (b) of Figure 16, the first sixth duration of this symbol is the time domain resource used for type2 LBT. The remainder of the symbol is used for the CPE of this slot. For example, at 15kHz, the length of a symbol is 71.35us, of which the first sixth duration = 25us is the time domain resource used for type2 LBT, and the last 46.35us is the symbol used for AGC.

Method 3: The symbol where the GAP is located includes time domain resources for type2 LBT.

Optionally, GAP symbols include time domain resources for type2 LBT. It can also be understood that the time domain resource used for type2 LBT is located on the last symbol of the time slot, or on the first symbol of the time slot. As shown in (c) of Figure 16, the first sixth duration of the symbol is used for the GAP of the time slot, and the GAP is the time domain resource used for type2 LBT. Optionally, the remaining part of the symbol is CPE, copying the contents of the previous symbol, or copying the contents of the next symbol. Optionally, the remaining part of the symbol carries PSSCH. For example, at 15kHz, the length of a symbol is 71.35us, of which the first sixth duration = 25us is the GAP, which is used for the time domain resources of type 2 LBT, and the last 46.35us is the CPE or carries the PSSCH. Or, as shown in (d) of Figure 16, the last sixth duration of the symbol is used for the GAP of the time slot, and the GAP is the time domain resource used for type2 LBT. Optionally, the remainder of the symbol is CPE, copying the contents of the previous symbol or copying the contents of the next symbol. Optionally, the remaining part of the symbol carries PSSCH. For example, at 15kHz, The length of a symbol is 71.35us, of which the last sixth duration = 25us is GAP, which is used for the time domain resources of type 2 LBT, and the first 46.35us is CPE or carries PSSCH.

Method 4: The last symbol of the previous time slot and the first symbol of the next time slot in two adjacent time slots include time domain resources for type2 LBT.

It can also be understood that the time domain resources used for type2 LBT are located in two adjacent time slots. The GAP symbol of the previous time slot and the AGC symbol of the next time slot include the time domain resources used for type2 LBT. As shown in (e) of Figure 16, AGC, sixth duration, and GAP occupy a total of 2 symbols. For example, at 30kHz, the length of a symbol is 35.68us, the AGC symbol is shortened to (35.68-A)us, and the GAP symbol is shortened to (35.68-B)us, where the sum of the lengths of A and B is equal to the sixth duration.

Beneficial effects of method 4: For example, at 30kHz, the length of a symbol is 35.68us. If the length of the sixth duration is 25us, the remaining time 35.68-25=10.68us is not enough for AGC. Therefore, method 4 is more effective under larger subcarrier spacing.

Method 5: The last symbol of the previous time slot and the first symbol of the next time slot in two adjacent time slots include time domain resources for type2 LBT.

It can also be understood that the time domain resources used for type2 LBT are located in two adjacent time slots. The GAP symbol of the previous time slot and the AGC symbol of the next time slot include the time domain resources used for type2 LBT. As shown in (f) of Figure 16, the sixth duration is located between the last symbol of the previous time slot and the first symbol of the next time slot. The first sixth duration of these two symbols is used for the GAP of the previous time slot, which is the time domain resource used for type2 LBT, and the remaining part of these two symbols is used for AGC. For example, at 30kHz, the length of one symbol is 35.68us, and the length of two symbols is 71.35us. The first sixth duration = 25us is the time domain resource used for type2 LBT, and the last 46.35us is the symbol used for AGC. As shown in (g) of Figure 16, the sixth duration is located between the last symbol of the previous time slot and the first symbol of the next time slot. The first sixth duration of these two symbols is used for the GAP of the previous time slot, which is the time domain resource used for type2 LBT, and the remaining part of these two symbols is used for AGC. For example, at 60kHz, the length of one symbol is 17.84us, and the length of two symbols is 35.68us. The first sixth duration = 25us is the time domain resource used for type2 LBT, and the last 10.68us is the symbol used for AGC.

Method 6: Increase the CP length between symbols in the time slot to ensure that there is exactly 25us at the end of the time slot.

The existing GAP symbol is too long, which may cause other UEs to successfully access the channel through type1LBT within this time period, causing the first COT of UE1 to be interrupted. However, through the constraints of the above solution, the GAP position and AGC position in the resource pool are still unified. For GAP, when the sending UE transmits, the receiving UE is still undergoing transceiver conversion and cannot receive. For AGC, transmission at a certain frequency domain position will not affect the AGC adjustment at subsequent positions.

In addition, as shown in Figure 15, for UEs (UE2, UE3, UE4) sharing the first COT, there are no UEs in some time slots (such as time slot 5) that require new access channels, so some UEs (such as UE3, UE4) can Continuous transfer, no GAP and/or AGC required. The following example illustrates the impact of type2 LBT duration on GAP and AGC within the time slot.

Optionally, the first symbol of each time slot in the first time slot set is a symbol used for AGC.

Optionally, the first symbol of a time slot that does not belong to the first time slot set in the first COT is not a symbol used for AGC; or, the first symbol of a time slot that does not belong to the first time slot set in the first COT symbols are used to transmit SL information.

Optionally, UE1 transmits on the first time slot and the second time slot within the first COT; or, UE2 transmits on the first time slot and the second time slot within the first COT. The first time slot and the second time slot are adjacent in the time domain. The last symbol of the first time slot is not a GAP symbol; or the last symbol of the first time slot is used to transmit SL information.

For example: (1) Time slot 1 is used for UE1 to send, and time slot 2 is also used for UE1 to send. Then, UE1 does not need to perform transceiver conversion. Therefore, the end position of time slot 1 does not require GAP.

(2) Time slot 1 is used for UE1 transmission, and time slot 2 is also used for UE1 transmission. Therefore, AGC is not required at the beginning of time slot 2 to achieve continuous transmission by UE1.

(3) Time slot 5 is used for UE1 to receive, and time slot 6 is used for UE1 to send. Then, UE1 needs to perform transceiver conversion, and the end position of time slot 5 requires GAP.

(4) Time slot 4 is used for UE3 and UE4 transmission, and time slot 5 is used for UE3 and UE4 transmission. Then, the end position of time slot 4 does not require GAP.

(5) Time slot 4 is used for UE3 and UE4 transmission, and time slot 5 is used for UE3 and UE4 transmission. Then, the starting position of time slot 5 does not require GAP.

Optionally, whether there is a GAP and/or AGC location in the time slot within the first COT may be predefined, preconfigured, or configured by the network.

The communication method provided by this application has been described in detail above, and the communication device provided by this application will be introduced below.

Referring to Figure 17, Figure 17 is a schematic block diagram of the communication device 1000 provided by this application.

In a possible design, as shown in Figure 17, the communication device 1000 includes a transceiver unit 1100 and a processing unit 1200. The communication device 1000 can implement steps or processes corresponding to those executed by the first terminal device in the above method embodiments. For example, the communication device 1000 can be the first terminal device, or can also configure a chip in the first terminal device or circuit. The transceiver unit 1100 is configured to perform operations related to reception and transmission of the first terminal device in the above method embodiment, and the processing unit 1200 is configured to perform operations related to processing of the first terminal device in the above method embodiment.

The transceiver unit 1100 is used to receive the first sideline control information SCI from the second terminal device, where the first SCI indicates the reserved resources of the second terminal device; the processing unit 1200 is used to determine the reserved resources of the second terminal device. All or part of it is located in the first COT, which is the initial COT of the first terminal device; the transceiver unit 1100 is also used to send the first COT sharing information to the second terminal device, and the first COT sharing information indicates whether it is allowed or not. Share the first COT.

Optionally, the processing unit 1200 is also used to determine the first resource, and the first resource is used to transmit the first COT shared information.

Optionally, the processing unit 1200 is specifically configured to: determine the first resource according to the reserved resources of the second terminal device; or, determine the first resource according to the reserved resources of the second terminal device in the first COT; or, according to The first reserved resource determines the first resource. The first reserved resource belongs to the reserved resource of the second terminal device in the first COT. The first reserved resource corresponds to one time slot in the time domain and corresponds to one in the frequency domain. sub-channel or interleaving. For the description of the first reserved resource, refer to the description in the corresponding embodiment, and will not be described again here.

Optionally, the processing unit 1200 is specifically configured to: determine the time domain resource of the first resource according to the time domain resource of the first reserved resource, wherein the time domain resource of the first resource is before the first reserved resource, and The first reserved resource interval is time domain resources of at least a first time interval.

Optionally, the processing unit 1200 is specifically configured to: determine the frequency domain resource of the first resource according to the frequency domain resource of the first reserved resource, where the frequency domain resource of the first resource is the frequency domain resource of the first reserved resource.

Optionally, the first COT sharing information is a sequence of the first resource, and the processing unit 1200 is further configured to determine the cyclic shift of the sequence according to at least one of the following parameters or conditions: whether the second terminal device is allowed to share the first COT; The time interval between the first reserved resource and the reference time slot, the reference time slot is the time slot of the first resource, or the starting time slot of the first COT; the offset information in the time domain and/or frequency domain, time domain and/or frequency domain offset information indicates that the second terminal device is in the first The offset in the time domain and/or frequency domain of the resources shared within the COT relative to the resources reserved by the second terminal device in the first COT; the frequency domain resource of the first reserved resource. Regarding the specific determination method of the cyclic shift of the first resource association, please refer to the description in the corresponding embodiment, which will not be described again here.

Optionally, in an implementation where the communication device 1000 is the first terminal device in the method embodiment, the transceiver unit 1100 may be a receiver. The receiver and transmitter can also be integrated into a single transceiver. The processing unit 1200 may be a processing device.

Among them, the functions of the processing device can be realized by hardware, or can also be realized by hardware executing corresponding software. For example, the processing device may include a memory and a processor, where the memory is used to store a computer program, and the processor reads and executes the computer program stored in the memory, so that the communication device 1000 performs the steps performed by the first terminal device in each method embodiment. Operation and/or processing. Alternatively, the processing means may comprise only the processor, with the memory for storing the computer program being external to the processing means. The processor is connected to the memory through circuits/wires to read and execute the computer program stored in the memory. As another example, the processing device may be a chip or an integrated circuit.

Alternatively, in an implementation in which the communication device 1000 is a chip or integrated circuit installed in the first terminal device, the transceiver unit 1100 may be a communication interface or an interface circuit. The processing unit 1200 may be a processor or microprocessor integrated on the chip or integrated circuit. No limitation is made here.

In another possible design, the communication device 1000 includes a transceiver unit 1100 and a processing unit 1200. The communication device 1000 can implement the steps or processes performed by the second terminal device corresponding to the above method embodiment. For example, the communication device 1000 can be a second terminal device, or can also configure a chip in the second terminal device or circuit. The transceiver unit 1100 is configured to perform operations related to reception and transmission of the second terminal device in the above method embodiment, and the processing unit 1200 is configured to perform operations related to processing of the second terminal device in the above method embodiment.

The transceiver unit 1100 is configured to send the first sideline control information to the first terminal device, and the first sideline control information indicates the reserved resources of the second terminal device; the transceiver unit 1100 is also configured to receive the first sideline control information from the first terminal device. The first COT sharing information indicates whether to allow or not share the first COT. The first COT sharing information is directed to the second terminal device. The first COT is the initial COT of the first terminal device. The second terminal All or part of the reserved resources of the device are located in the first COT; the processing unit 1200 is configured to determine whether to share the first COT according to the first COT sharing information.

Optionally, the processing unit 1200 is further configured to determine according to the first resource that the first COT shared information is indicated to the second terminal device, wherein the first resource is used to transmit the first COT shared information, and the first resource is configured according to the first resource. The first resource is determined based on the reserved resources of the second terminal device, or the first resource is determined based on the reserved resources of the second terminal device, or the first resource is determined based on the reserved resources of the second terminal device in the first COT. , or, the first resource is determined based on the first reserved resource, the first reserved resource belongs to the reserved resource of the second terminal device in the first COT, and the first reserved resource corresponds to a time slot in the time domain, Corresponds to a sub-channel or interlace in the frequency domain.

Optionally, the processing unit 1200 is specifically configured to: after determining the time domain resource of the first resource, the time domain resource separated by at least a first time interval is the time domain resource of the first reserved resource; determine that the first COT shared information is Indicated to the second terminal device.

Optionally, the processing unit 1200 is specifically configured to: determine that the frequency domain resource of the first resource is the same as the frequency domain resource of the first reserved resource; determine that the first COT sharing information is indicated to the second terminal device.

Optionally, the transceiver unit 1100 is also configured to receive the second COT sharing information on the second resource. The second resource is used to indicate that the second COT sharing information is directed to the third terminal device. The second COT sharing information indicates whether Share the first A COT; the processing unit 1200 is also configured to determine the resources shared by the third terminal in the first COT according to the second resource and the second COT sharing information; the processing unit 1200 is also configured to determine the resources shared by the third terminal device in the first COT according to the second terminal device and the third terminal. The time domain resources of the resources shared within the first COT determine the first time slot set, and each time slot of the first time slot set in the first COT includes time domain resources for type2 LBT.

Optionally, in an implementation where the communication device 1000 is the second terminal device in the method embodiment, the transceiver unit 1100 may be a receiver. The receiver and transmitter can also be integrated into a single transceiver. The processing unit 1200 may be a processing device.

Among them, the functions of the processing device can be realized by hardware, or can also be realized by hardware executing corresponding software. For example, the processing device may include a memory and a processor, where the memory is used to store a computer program, and the processor reads and executes the computer program stored in the memory, so that the communication device 1000 performs the steps performed by the second terminal device in each method embodiment. Operation and/or processing. Alternatively, the processing means may comprise only the processor, with the memory for storing the computer program being external to the processing means. The processor is connected to the memory through circuits/wires to read and execute the computer program stored in the memory. As another example, the processing device may be a chip or an integrated circuit.

Alternatively, in an implementation in which the communication device 1000 is a chip or integrated circuit installed in the second terminal device, the transceiver unit 1100 may be a communication interface or an interface circuit. The processing unit 1200 may be a processor or microprocessor integrated on the chip or integrated circuit. No limitation is made here.

Figure 18 shows a communication device 1800 provided by an embodiment of the present application. The device shown in Figure 18 can be a hardware circuit implementation of the device shown in Figure 17 . The communication device can be adapted to the flow chart shown above to perform the functions of the terminal device or network device in the above method embodiment. For convenience of explanation, FIG. 18 shows only the main components of the communication device.

The communication device 1800 may be a terminal device, capable of realizing the functions of the first terminal device or the second terminal device in the method provided by the embodiments of the present application. The communication device 1800 may also be a device that can support the first terminal device or the second terminal device to implement the corresponding functions in the method provided by the embodiment of the present application. The communication device 1800 may be a chip system. In the embodiments of this application, the chip system may be composed of chips, or may include chips and other discrete devices. For specific functions, please refer to the description in the above method embodiment.

The communication device 1800 includes one or more processors 1810, which are used to implement or support the communication device 1800 to implement the functions of the first terminal device or the second terminal device in the method provided by the embodiment of the present application. For details, please refer to the detailed description in the method example and will not be repeated here. The processor 1810 can also be called a processing unit or processing module, and can implement certain control functions. The processor 1810 may be a general-purpose processor, a special-purpose processor, or the like. For example, include: central processing unit, application processor, modem processor, graphics processor, image signal processor, digital signal processor, video codec processor, controller, memory, and/or neural network processor wait. The central processing unit may be used to control the communication device 1800, execute software programs and/or process data. Different processors may be independent devices, or may be integrated in one or more processors, for example, integrated on one or more application specific integrated circuits. It can be understood that the processor in the embodiment of the present application can be a central processing unit (CPU), or other general-purpose processor, digital signal processor (DSP), or application-specific integrated circuit (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor can be a microprocessor or any conventional processor.

Optionally, the communication device 1800 includes one or more memories 1820 to store instructions 1840, which can be executed on the processor 1810, so that the communication device 1800 performs the methods described in the above method embodiments. Law. Memory 1820 and processor 1810 are coupled. The coupling in the embodiment of this application is an indirect coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information interaction between devices, units or modules. The processor 1810 may cooperate with the memory 1820. At least one of the at least one memory may be included in the processor. It should be noted that the memory 1820 is not necessary, so it is illustrated with a dotted line in FIG. 18 .

Optionally, the memory 1820 may also store data. The processor and memory can be provided separately or integrated together. In this embodiment of the present application, the memory 1820 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or it may be a volatile memory (volatile memory). For example, random-access memory (RAM). In the embodiments of the present application, the processor may also be flash memory, read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM) ), electrically erasable programmable read-only memory (electrically EEPROM, EEPROM), register, hard disk, mobile hard disk, CD-ROM or any other form of storage media well known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and storage media may be located in an ASIC. Additionally, the ASIC can be located in network equipment or terminal equipment. Of course, the processor and the storage medium can also exist as discrete components in network equipment or terminal equipment.

Memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory in the embodiment of the present application can also be a circuit or any other device capable of realizing a storage function, used to store program instructions and/or data.

Optionally, the communication device 1800 may include instructions 1830 (sometimes also referred to as codes or programs), and the instructions 1830 may be executed on the processor, causing the communication device 1800 to perform the methods described in the above embodiments. . Data may be stored in processor 1810.

Optionally, the communication device 1800 may also include a transceiver 1850 and an antenna 1806. The transceiver 1850 may be called a transceiver unit, transceiver module, transceiver, transceiver circuit, transceiver, input/output interface, etc., and is used to realize the transceiver function of the communication device 1800 through the antenna 1806.

The processor 1810 and transceiver 1850 described in this application can be implemented in integrated circuits (ICs), analog ICs, radio frequency identification (RFID), mixed signal ICs, ASICs, printed circuit boards (printed circuit boards) board, PCB), or electronic equipment, etc. The communication device that implements the communication described in this article can be an independent device (for example, an independent integrated circuit, a mobile phone, etc.), or it can be a part of a larger device (for example, a module that can be embedded in other devices). For details, please refer to the above-mentioned information. The description of terminal equipment and network equipment will not be repeated here.

Optionally, the communication device 1800 may also include one or more of the following components: a wireless communication module, an audio module, an external memory interface, an internal memory, a universal serial bus (USB) interface, a power management module, and an antenna. Speakers, microphones, input and output modules, sensor modules, motors, cameras, or displays, etc. It can be understood that in some embodiments, the communication device 1800 may include more or fewer components, or some components may be integrated, or some components may be separated. These components may be implemented in hardware, software, or a combination of software and hardware.

In addition, this application also provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are run on the computer, each method embodiment of the application is executed by the first terminal device. operations and/or processes are performed.

This application also provides a computer-readable storage medium. Computer instructions are stored in the computer-readable storage medium. When the computer instructions are run on the computer, the operations performed by the second terminal device in each method embodiment of the application are performed. and/or the process is executed.

This application also provides a computer program product. The computer program product includes computer program code or instructions. When the computer program code or instructions are run on a computer, the operations performed by the first terminal device in each method embodiment of the application are caused and/or or process is executed.

This application also provides a computer program product. The computer program product includes computer program code or instructions. When the computer program code or instructions are run on a computer, the operations performed by the second terminal device in each method embodiment of the application are caused and/or or process is executed.

In addition, this application also provides a chip, which includes a processor. The memory used to store the computer program is provided independently of the chip, and the processor is used to execute the computer program stored in the memory, so that the operations and/or processing performed by the corresponding device or network element in any method embodiment are performed.

Further, the chip may also include a communication interface. The communication interface may be an input/output interface, or an interface circuit, etc. Further, the chip may further include the memory.

In addition, this application also provides a communication system, including one or more of the devices or network elements involved in the embodiments of this application.

The processor in the embodiment of the present application may be an integrated circuit chip and has the ability to process signals. During the implementation process, each step of the above method embodiment can be completed through an integrated logic circuit of hardware in the processor or instructions in the form of software. The processor can be a general processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic Devices, discrete gate or transistor logic devices, discrete hardware components. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the methods disclosed in the embodiments of the present application can be directly implemented by a hardware encoding processor, or executed by a combination of hardware and software modules in the encoding processor. The software module can be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other mature storage media in this field. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

The memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically removable memory. Erase electrically programmable read-only memory (EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of illustration, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (direct rambus RAM, DRRAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. What exactly are these functions based on? Whether implemented in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be described again here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.

The term "and/or" in this application is just an association relationship describing related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, alone There are three situations B. Among them, A, B and C can all be singular or plural without limitation.

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage media include: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (44)

A communication method, characterized by including: The first terminal device receives the first sideline control information SCI from the second terminal device, where the first SCI indicates the reserved resources of the second terminal device; The first terminal device determines that all or part of the reserved resources of the second terminal device are located within a first channel occupancy time COT, and the first COT is the initial COT of the first terminal device; The first terminal device sends first COT sharing information to the second terminal device, and the first COT sharing information indicates whether sharing of the first COT is allowed or not. The method of claim 1, further comprising: The first terminal device determines a first resource, and the first resource is used to transmit the first COT shared information. The method according to claim 2, characterized in that the first terminal device determines the first resource, including: The first terminal device determines the first resource according to the reserved resources of the second terminal device; or, The first terminal device determines the first resource according to the reserved resources of the second terminal device in the first COT; or, The first terminal device determines the first resource according to a first reserved resource, which belongs to the reserved resource of the second terminal device in the first COT. The reserved resource corresponds to a time slot in the time domain and corresponds to a sub-channel or interleaving in the frequency domain. The method according to claim 3, characterized in that: The first reserved resource is the resource with the smallest time slot index and the smallest subchannel or interleaving index among the reserved resources in the first COT, or, The first reserved resource is the resource with the smallest time slot index and the largest subchannel or interleaving index among the reserved resources in the first COT, or, The first reserved resource is the resource with the largest timeslot index, subchannel or interleaving index among the reserved resources in the first COT, or, The first reserved resource is the resource with the largest time slot index and the smallest subchannel or interleaving index among the reserved resources in the first COT. The method according to claim 3 or 4, characterized in that the first terminal device determines the first resource according to the first reserved resource, including: The first terminal device determines the time domain resource of the first resource according to the time domain resource of the first reserved resource, wherein the time domain resource of the first resource is before the first reserved resource. , a time domain resource that is at least a first time interval away from the first reserved resource. The method according to any one of claims 3 to 5, characterized in that the first terminal device determines the first resource according to the first reserved resource, including: The first terminal device determines the frequency domain resource of the first resource according to the frequency domain resource of the first reserved resource, and the frequency domain resource of the first resource is the frequency domain resource of the first reserved resource. . The method according to any one of claims 3 to 6, wherein the first COT shared information is the sequence of the first resource, and the method further includes: The first terminal device determines the cyclic shift of the sequence according to at least one of the following parameters or conditions: Whether the second terminal device is allowed to share the first COT, The time interval between the first reserved resource and the reference time slot, Offset information in the time domain and/or frequency domain, the offset information in the time domain and/or frequency domain indicating that the resources shared by the second terminal device in the first COT are relative to the second terminal device The offset of the reserved resources in the first COT in the time domain and/or frequency domain, or The frequency domain resource of the first reserved resource, Wherein, the reference time slot is a time slot of the first resource, or the reference time slot is a starting time slot of the first COT. The method of claim 7, wherein the cyclic shift of the sequence is determined based on a first cyclic shift and a second cyclic shift, wherein, The first cyclic shift indicates whether the second terminal device is allowed to share the first COT, and the second cyclic shift indicates the time domain and/or frequency domain offset information. The method of claim 7, wherein the cyclic shift of the sequence is determined based on a first cyclic shift and a second cyclic shift, wherein, The cyclic shift of the sequence indicates whether the second terminal device is allowed to share the first COT, and the first cyclic shift indicates the time between the first reserved resource and the reference time slot. interval, the second cyclic shift indicates the offset information in the time domain and/or frequency domain. The method of claim 7, wherein the cyclic shift of the sequence is determined based on a first cyclic shift and a second cyclic shift, wherein, The first cyclic shift indicates whether the second terminal device is allowed to share the first COT, and the second cyclic shift indicates the time between the first reserved resource and the reference time slot. interval, the third cyclic shift is the difference between the cyclic shifts of the sequences of two adjacent resource blocks RB in the first resource, and the third cyclic shift indicates the time domain and/or frequency domain offset information, or, The first cyclic shift indicates whether the second terminal device is allowed to share the first COT, the second cyclic shift indicates the time domain and/or frequency domain offset information, and the third cyclic shift bit is the difference between two adjacent RBs in the first resource, and the third cyclic shift indicates the time interval between the first reserved resource and the reference time slot. The method according to any one of claims 7 to 10, characterized in that the sequence is a sequence of any resource block RB in the first resource, or the sequence is a sequence of resource blocks RB in the first resource. The sequence of RBs with the smallest index. The method according to any one of claims 1 to 11, characterized in that the first COT shared information is carried on a physical sidelink shared channel (PSFCH). The method according to any one of claims 1 to 6, characterized in that, The first COT sharing information includes N pieces of indication information. Each indication information in the N pieces of indication information includes identification information of a terminal device and resource information of the terminal device sharing the first COT. N is positive. integer. The method according to claim 13, characterized in that: The identification information of the terminal equipment includes M terminal equipment identifications, and the resource information shared by the terminal equipment of the first COT indicates a first time unit, and the first time unit is corresponding to the M terminal equipment identifications. The time unit shared by terminal equipment in the first COT. The channel corresponding to the first COT includes L interleaving or sub-channels. Each indication information indicates the i-th terminal among the M terminal equipment identities. The terminal device corresponding to the device identifier shares the i-th interlace or sub-channel of the L interlaces or sub-channels, where M, L and i are all positive integers, and M is less than or equal to L. The method according to claim 13 or 14, characterized in that, The first COT sharing information also indicates that the resources shared by the second terminal device in the first COT and the reserved resources of the second terminal device in the first COT are in the time domain and/or frequency. Offset on the domain. The method according to any one of claims 1 to 6 and 13 to 15, characterized in that the first COT shared information is carried in first-order SCI, second-order SCI, media access control-control element MAC CE, Any signaling in Radio Resource Control RRC. The method according to claim 16, characterized in that the first-order SCI includes a first field, the first field indicates that the second-order SCI carries the first COT shared information, or the MAC CE carries The first COT shared information, or the physical sidelink shared channel PSFCH carries the first COT shared information. The method according to any one of claims 1 to 17, characterized in that the resources used to send the first COT shared information satisfy the following conditions in the time domain: The time interval in the time domain between the resource for receiving the first SCI and the resource for sending the first COT shared information is greater than the second duration; and/or, The time interval in the time domain between the resource for sending the first COT shared information and the resource for shared transmission by the second terminal device in the first COT is greater than or equal to the fifth time length. The method according to any one of claims 1 to 18, characterized in that each time slot of the first time slot set in the first COT includes a time domain for Type 2 listen-before-talk LBT. resources, among which, The first time slot set is a set of time slots for each terminal device sharing the first COT to access the first COT, or, The first time slot set is a set of time slots for each terminal device sharing the first COT to transmit sidelink information, or, The first time slot set is a set of all time slots in the first COT. The method according to claim 19, characterized in that the automatic gain control AGC symbols and/or gap GAP symbols in each time slot include time domain resources for type 2 LBT. A communication method, characterized by including: The second terminal device sends first SCI sideline control information to the first terminal device, where the first SCI indicates the reserved resources of the second terminal device; The second terminal device receives the first channel occupancy time COT sharing information from the first terminal device, and the first COT sharing information indicates whether sharing of the first COT is allowed or not, and the first COT is the The initial COT of the first terminal device, all or part of the reserved resources of the second terminal device are located in the first COT; The second terminal device determines whether to share the first COT according to the first COT sharing information. The method according to claim 21, characterized in that, the method further includes: The second terminal device determines that the first COT shared information is indicated to the second terminal device according to a first resource, wherein the first resource is used to transmit the first COT shared information, The first resource is determined based on the reserved resources of the second terminal device, or the first resource is determined based on The second terminal device is determined by the reserved resources in the first COT, or the first resources are determined based on the first reserved resources, and the first reserved resources belong to the second terminal. The equipment reserves resources in the first COT. The first reserved resources correspond to a time slot in the time domain and to a sub-channel or interleave in the frequency domain. The method according to claim 22, characterized in that: The first reserved resource is the resource with the smallest time slot index and the smallest subchannel or interleaving index among the reserved resources in the first COT, or, The first reserved resource is the resource with the smallest time slot index and the largest subchannel or interleaving index among the reserved resources in the first COT, or, The first reserved resource is the resource with the largest timeslot index, subchannel or interleaving index among the reserved resources in the first COT, or, The first reserved resource is the resource with the largest time slot index and the smallest subchannel or interleaving index among the reserved resources in the first COT. The method according to claim 22 or 23, characterized in that the second terminal device determines that the first COT shared information is indicated to the second terminal device according to the first resource, including: After the second terminal device determines the time domain resource of the first resource, the time domain resource separated by at least a first time interval is the time domain resource of the first reserved resource; The second terminal device determines that the first COT sharing information is indicated to the second terminal device. The method according to any one of claims 22 to 24, characterized in that the second terminal device determines that the first COT shared information is indicated to the second terminal device according to the first resource, include: The second terminal device determines that the frequency domain resource of the first resource is the same as the frequency domain resource of the first reserved resource; The second terminal device determines that the first COT sharing information is indicated to the second terminal device. The method according to any one of claims 23 to 25, characterized in that the first COT shared information is a sequence of the first resource, and the cyclic shift of the sequence indicates at least one of the following information: Whether the second terminal device is allowed to share the first COT, The time interval between the first reserved resource and the reference time slot, Offset information in the time domain and/or frequency domain, the offset information in the time domain and/or frequency domain indicating that the resources shared by the second terminal equipment in the first COT are the same as those shared by the second terminal equipment in the first COT. The offset of the reserved resources in the first COT in the time domain and/or frequency domain, or The frequency domain resource of the first reserved resource, The reference time slot is the time slot of the first resource, or the starting time slot of the first COT. The method of claim 26, wherein the cyclic shift of the sequence is determined based on a first cyclic shift and a second cyclic shift, wherein, The first cyclic shift indicates whether the second terminal device is allowed to share the first COT, and the second cyclic shift indicates the time domain and/or frequency domain offset information. The method of claim 26, wherein the cyclic shift of the sequence is determined based on a first cyclic shift and a second cyclic shift, wherein, The cyclic shift of the sequence indicates whether the second terminal device is allowed to share the first COT, and the first cyclic shift indicates the time between the first reserved resource and the reference time slot. interval, the second cyclic shift indicates the offset information in the time domain and/or frequency domain. The method of claim 26, wherein the cyclic shift of the sequence is determined based on a first cyclic shift and a second cyclic shift, wherein, The first cyclic shift indicates whether the second terminal device is allowed to share the first COT, and the second cyclic shift indicates the time between the first reserved resource and the reference time slot. interval, the third cyclic shift is the difference between the cyclic shifts of the sequences of two adjacent resource blocks RB in the first resource, and the third cyclic shift indicates the time domain and/or frequency domain offset offset information of information, or, The first cyclic shift indicates whether the second terminal device is allowed to share the first COT, the second cyclic shift indicates the time domain and/or frequency domain offset information, and the third cyclic shift bit is the difference between two adjacent RBs in the first resource, and the third cyclic shift indicates the time interval between the first reserved resource and the reference time slot. The method according to any one of claims 26 to 29, characterized in that the sequence is a sequence of any resource block RB in the first resource, or the sequence is a sequence of resource blocks RB in the first resource. The sequence of RBs with the smallest index. The method according to any one of claims 21 to 30, characterized in that the first COT shared information is carried on a physical sidelink shared channel (PSFCH). The method according to any one of claims 21 to 25, characterized in that, The first COT sharing information includes N pieces of indication information. Each indication information in the N pieces of indication information indicates the identification information of the terminal device and the resource information of the terminal device sharing the first COT. N is a positive integer. . The method according to claim 32, characterized in that: The identification information of the terminal equipment includes M terminal equipment identifications, and the resource information of the terminal equipment sharing the first COT indicates a first time unit, and the first time unit is when the plurality of terminal equipments are in the The time unit shared within the first COT, the channel corresponding to the first COT includes L interleaved or sub-channels, and each indication information indicates the terminal corresponding to the i-th terminal equipment identification among the M terminal equipment identifications. The devices share the i-th interlace or sub-channel of the L interlaces or sub-channels, where M, L and i are all positive integers, and M is less than or equal to L. The method according to claim 32 or 33, characterized in that, The first COT sharing information also indicates that the resources shared by the second terminal device in the first COT are in the time domain and/or relative to the reserved resources of the second terminal device in the first COT. offset in the frequency domain. The method according to any one of claims 21 to 25 and 32 to 34, characterized in that the first COT shared information is carried in first-order SCI, second-order SCI, media access control-control element MAC CE, Any signaling in Radio Resource Control RRC. The method according to claim 35, characterized in that the first-order SCI includes a first field, the first field indicates that the second-order SCI carries the first COT shared information, or the MAC CE carries The first COT shared information, or the physical sidelink shared channel PSFCH carries the first COT shared information. The method according to any one of claims 21 to 35, characterized in that the resource used to receive the first COT shared information satisfies the following conditions in the time domain: The time interval in the time domain between the resource that sends the first SCI and the resource that receives the first COT shared information is greater than the second duration; and/or, The time interval in the time domain between the resources for receiving the first COT shared information and the resources for shared transmission by the second terminal device in the first COT is greater than or equal to the fifth time length. The method according to any one of claims 21 to 37, characterized in that each time slot of the first time slot set in the first COT includes a time domain for Type 2 listen-before-talk LBT. resources, among which, The first time slot set is a set of time slots for each terminal device sharing the first COT to access the first COT, or, The first time slot set is a set of time slots for each terminal device sharing the first COT to transmit sidelink information, or, The first time slot set is a set of all time slots in the first COT. The method according to claim 38, characterized in that the time domain resources for type 2 LBT in each time slot are located in automatic gain control AGC symbols and/or gap GAP symbols. The method according to claim 38 or 39, characterized in that, the method further includes: The second terminal device receives the second COT sharing information, the second COT sharing information is indicated to the third terminal device, and the second COT sharing information indicates whether to share the first COT; The second terminal device receives a second SCI from the third terminal device, the second SCI indicates the reserved resources of the third terminal device; The second terminal device determines the first time slot set according to the reserved resources of the third terminal device and the second COT shared information. A communication device, characterized by comprising a module for executing the method according to any one of claims 1 to 20, or 21 to 40. A communication device, characterized in that it includes at least one processor, the at least one processor is coupled to at least one memory, and the at least one processor is used to execute a computer program or instructions stored in the at least one memory, so that The method described in any one of claims 1 to 20 is performed, or the method described in any one of claims 21 to 40 is performed. A computer-readable storage medium, characterized in that computer instructions are stored in the computer-readable storage medium. When the computer instructions are run on a computer, the method as claimed in any one of claims 1 to 20 is executed, the method according to any one of claims 21 to 40 is executed. A computer program product, characterized in that the computer program product includes computer program code. When the computer program code is run on a computer, the method according to any one of claims 1 to 20 is executed, A method as claimed in any one of claims 21 to 40 is performed.